江湖救急-一道列方程的数学题!一个人去买布,用540元买了两种布共138尺,其中红布每尺3元,黄布每尺5元,两种布各买了

巧儿20032022-10-04 11:39:544条回答

江湖救急-一道列方程的数学题!
一个人去买布,用540元买了两种布共138尺,其中红布每尺3元,黄布每尺5元,两种布各买了多少尺?
要求列方程.请说明清楚为什么?

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吴天深圳 共回答了27个问题 | 采纳率96.3%
二元:设两种布各买了x尺,y尺.
x+y=138
3x+5y=540
解得x=75,y=63
一元:设红布买了x尺,黄布买了(138-x)尺.
3x+5(138-x)=54
解得x=75,138-x=63
算术法:假设都是买红布,则花钱3*138=414元,实际花了540元,多花了540-414=126元,是因为还买了黄布,每把一尺红布换成黄布,都要多花5-3=2元,所以一共要把126/2=63尺红布换成黄布,即买63尺黄布,所以买138-63=75尺红布.
1年前
小李的飞刀 共回答了10个问题 | 采纳率
设红布买了x尺,黄布买了y尺
3x+5y=540
x+y=138
(单价*数量=总价)
1年前
hml2003 共回答了4个问题 | 采纳率
设红布为X 黄步就是138-X
X*3+(138-X)*5=540
1年前
skai123 共回答了14个问题 | 采纳率
设红X黄Y
X+Y=138
3X+5Y=540
1年前

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else gPlayOrder=CHESS1; return(gPlayOrder); } /*获取按键值*/ int GetKey(void) { char lowbyte; int press; while (bioskey(1) == 0) ;/*如果用户没有按键,空循环*/ press=bioskey(0); lowbyte=press&0xff; press=press&0xff00 + toupper(lowbyte); return(press); } /*落子错误处理*/ void DoError(void) { sound(1200); delay(50); nosound(); } /*赢棋处理*/ void DoWin(int Order) { sound(1500);delay(100); sound(0); delay(50); sound(800); delay(100); sound(0); delay(50); sound(1500);delay(100); sound(0); delay(50); sound(800); delay(100); sound(0); delay(50); nosound(); textcolor(RED+BLINK); gotoxy(25,20); if(Order==CHESS1) cputs("PLAYER1 WIN!"); else cputs("PLAYER2 WIN!"); gotoxy(25,21); cputs(" \<^+^>/"); getch(); } /*走棋*/ int ChessGo(int Order,struct point Cursor) { /*判断交叉点上有无棋子*/ if(gChessBoard[Cursor.x][Cursor.y]==CHESSNULL) { /*若没有棋子, 则可以落子*/ gotoxy(Cursor.x+MAPXOFT,Cursor.y+MAPYOFT); textcolor(LIGHTBLUE); putch(Order); gotoxy(Cursor.x+MAPXOFT,Cursor.y+MAPYOFT); gChessBoard[Cursor.x][Cursor.y]=Order; return TRUE; } else return FALSE; } /*判断当前行棋方落子后是否赢棋*/ int JudgeWin(int Order,struct point Cursor) { int i; for(i=0;i<4;i++) /*判断在指定方向上是否有连续5个行棋方的棋子*/ if(JudgeWinLine(Order,Cursor,i)) return TRUE; return FALSE; } /*判断在指定方向上是否有连续5个行棋方的棋子*/ int JudgeWinLine(int Order,struct point Cursor,int direction) { int i; struct point pos,dpos; const int testnum = 5; int count; switch(direction) { case 0:/*在水平方向*/ pos.x=Cursor.x-(testnum-1); pos.y=Cursor.y; dpos.x=1; dpos.y=0; break; case 1:/*在垂直方向*/ pos.x=Cursor.x; pos.y=Cursor.y-(testnum-1); dpos.x=0; dpos.y=1; break; case 2:/*在左下至右上的斜方向*/ pos.x=Cursor.x-(testnum-1); pos.y=Cursor.y+(testnum-1); dpos.x=1; dpos.y=-1; break; case 3:/*在左上至右下的斜方向*/ pos.x=Cursor.x-(testnum-1); pos.y=Cursor.y-(testnum-1); dpos.x=1; dpos.y=1; break; } count=0; for(i=0;i=0&&pos.x<=18&&pos.y>=0&&pos.y<=18) { if(gChessBoard[pos.x][pos.y]==Order) { count++; if(count>=testnum) return TRUE; } else count=0; } pos.x+=dpos.x; pos.y+=dpos.y; } return FALSE; } /*移动光标*/ void MoveCursor(int Order,int press) { switch(press) { case PLAY1UP: if(Order==CHESS1&&gCursor.y>0) gCursor.y--; break; case PLAY1DOWN: if(Order==CHESS1&&gCursor.y<18) gCursor.y++; break; case PLAY1LEFT: if(Order==CHESS1&&gCursor.x>0) gCursor.x--; break; case PLAY1RIGHT: if(Order==CHESS1&&gCursor.x<18) gCursor.x++; break; case PLAY2UP: if(Order==CHESS2&&gCursor.y>0) gCursor.y--; break; case PLAY2DOWN: if(Order==CHESS2&&gCursor.y<18) gCursor.y++; break; case PLAY2LEFT: if(Order==CHESS2&&gCursor.x>0) gCursor.x--; break; case PLAY2RIGHT: if(Order==CHESS2&&gCursor.x<18) gCursor.x++; break; } gotoxy(gCursor.x+MAPXOFT,gC
江湖救急 help me 一、加偏旁组字(每个5个)衣 兑 舟 麻 舌 缶 (提示必须是加偏旁!每个都要有5个加偏旁组字
江湖救急 help me
一、加偏旁组字(每个5个)
衣 兑 舟 麻 舌 缶 (提示必须是加偏旁!每个都要有5个加偏旁组字的新字哦)
二、 矗查( )部,再查( )画
三、下面的字添上一笔、去掉一笔或者将某一笔画稍加变化,它就变成另外一个字.
苦( ) 持( ) 名( ) 厌( )
陶浅浅1年前2
wangjiantao 共回答了19个问题 | 采纳率89.5%
1.
衣:依,铱,袅
兑:锐,税,说
舟:盘
麻:嘛
舌:适
3.
名--〉各
厌--〉庆
江湖救急!我国第一座自行设计、自行建造的30万千瓦核电站,于一九九一年12月15日建成发电.目前,更大规模的第二期工程正
江湖救急!
我国第一座自行设计、自行建造的30万千瓦核电站,于一九九一年12月15日建成发电.目前,更大规模的第二期工程正在建设之中.这座核电站建在( )
A.浙江省秦山 B.广东省大亚湾 C.湖北省葛洲坝 D.四川省西昌
萤萤小虫1年前2
青山凡鸟 共回答了18个问题 | 采纳率94.4%
A
江湖救急~请问一些英语问题!请问如果要表达的是昨天的事情,那么下列哪个句子是正确的?1.When I arrived a
江湖救急~请问一些英语问题!
请问如果要表达的是昨天的事情,那么下列哪个句子是正确的?
1.When I arrived at school,the school was closed.After that,I understood why the school was closed.Because it was Saturday.
2.When I arrived at school,the school is closed.After that,I understood why the school is closed.Because it was Saturday.
3.When I arrived at school,the school was closed.After that,I understood why the school is closed.Because it was Saturday.
zycsb1年前3
飘飘蓝韵 共回答了20个问题 | 采纳率95%
都是过去时,选1
江湖救急!已知a、b、c是不全相等的实数,求证:(a2+1)(b2+1)(c2+1)>8abc2是平方
apple123liu1年前3
fucjia 共回答了21个问题 | 采纳率90.5%
因为 a2-2a+1>=0
所以 (a2+1)>=2a
(b2+1)>=2b
(c2+1)>=2c
所有式子两边相乘
(a2+1)(b2+1)(c2+1)>=8abc
等号是在a=b=c=1时成立
又因为a、b、c是不全相等的实数
所以等号不成立
所以(a2+1)(b2+1)(c2+1)>8abc
江湖救急!有没有关于名作者的文章!
江湖救急!有没有关于名作者的文章!
如罗曼·罗兰、罗宾德拉纳德.泰戈尔、鲁迅、普希金 、雨果、托尔斯泰等的!
麦兜的nn1年前1
bb08shop 共回答了21个问题 | 采纳率100%
巴黎圣母院,雨果
鲁迅的《野草》
泰戈尔的《吉檀迦利》
《普希金诗选》·(俄)普希金
江湖救急:“骐骥一跃,不能十步;驽马十驾,功不在舍.锲而舍之,朽木不折;锲而不舍,金石可镂.”的意思. 谢谢各位大神.
江湖救急:“骐骥一跃,不能十步;驽马十驾,功不在舍.锲而舍之,朽木不折;锲而不舍,金石可镂.”的意思. 谢谢各位大神. 荀子 劝学里边的.
带口罩的蚊子1年前1
rossiwang 共回答了15个问题 | 采纳率93.3%
骏马一跨跃,也不足十步远;劣马拉车走十天,(也能走得很远,)它的成功就在于不停地走.(如果)刻几下就停下来了,(那么)腐烂的木头也刻不断.(如果)不停地刻下去,(那么)金石也能雕刻成功.
江湖救急!求解高一三角函数问题~!
江湖救急!求解高一三角函数问题~!
求y=[(sin3x*sin3x^3+cos3x*cosx^3)/cos2x^2]+sin2x的最小值

这是式子

哆菈1年前2
满哥进城 共回答了17个问题 | 采纳率94.1%
先运用积化和差公式
sinx*sin3x*sin2x=(cos2x-cos4x)*sin2x/2
cosx*cos3x*cos2x=(cos2x+cos4x)* cos2x/2
相加化简
sinx*sin3x*sin2x+ cosx*cos3x*cos2x=(cos2x+cos4x*cos2x)/2
=cos2x(1+2cos22x-1)/2
=cos32x
最后的式子= cos2x+sin2x
=(根号2)*sin(2x+∏/4)
所以最小值是负的根号2
江湖救急 求圆心的直线x-y-4=0上,并且经过圆x^2+y^2+6x-4=0与圆x^2+y^2+6x-28=0的交点的
江湖救急
求圆心的直线x-y-4=0上,并且经过圆x^2+y^2+6x-4=0与圆x^2+y^2+6x-28=0的交点的圆的方程
对不起发错了
求圆心的直线x-y-4=0上,并且经过圆x^2+y^2+6x-4=0与圆x^2+y^2+6y28=0的交点的圆的方程
求正解
王鑫瑞1年前1
tgcynhh 共回答了19个问题 | 采纳率68.4%
你所说的两个圆的方程可以化为
(x+3)^2+y^2=13
(x+3)^2+y^2=37
这两个圆圆心相同,半径不等,应该会组成同心环.不存在交点
你看是不是问题发错了
江湖救急!1.求证:若点M是三角形ABC的重心,则向量MA+MB+MC=0向量 2.化简sinx/1-cosx 乘以根号
江湖救急!
1.求证:若点M是三角形ABC的重心,则向量MA+MB+MC=0向量 2.化简sinx/1-cosx 乘以根号下(tanx-sinx)/(tanx+sinx)
3.已知向量a=(负二分之一,根号三比二),向量OA=向量a+b,若三角形AOB是以O为定点的等腰直角三角形,求向量b及三角形AOB的面积
4.试用向量方法证明:圆的直径所对的圆周角为直角.
答得好加分.能答几题就达几题.
gg独立性1年前1
wwwyulian 共回答了20个问题 | 采纳率85%
1. 过点A做MB平行线,过点B做MA,交于点P,联结MP,交AB于O
向量MP=向量MA+MB么
又因M是ABC重心,有MO=1/2CM
MO=1/2MP
所以CM=MA+MB 即MA+MB+mc=0
2..如果没理解错的话.答案是 1
把更号里的那个分式上下同乘cosX 就可以了
3..应该有几种情况吧,画画图就知道了,一个面积是1/2,一个市1/4,不知道还有么有其他
情况
4..过圆心O做任意直径AB,圆周上任取一点C,联结OC
OA=OB=OC
貌似直角三角形就有这样一个定理吧?
江湖救急.几个英语问题啊.1.It is the first time that I ____ this kind of
江湖救急.几个英语问题啊.
1.It is the first time that I ____ this kind of moon cake.
A.enjoyed B.have enjoyed C.enjoy D.enjoying
2.I told Sally how to get here,but perhaps I ____ for her.
A.had to write it out B.must have written it out C.should have written it out D.ought to write it out
3.My son stayed in an ____ country for about half a year,so his spoken English is much better than before.
A.English-speaking B.English-spoken
4.I came here with your mother ____ to see you.
A.specially B.special C.especially D.especial
5.More than one person ____ made the same mistake.
A.have B.has C.is D.are
卡卡3261年前7
听雪听雨 共回答了11个问题 | 采纳率100%
1.B截止目前时间点,我第一次享用到,现在完成
2.C我本应写下来
3.A固定说法
4.A A特地,专程 B特别的 C特别是
5.B谓语动词依据one person
江湖救急!没分了 好心人帮忙啊!
江湖救急!没分了 好心人帮忙啊!
we often 空格 to Charles,but he never 空格to us 1writes~~writes 2write~~write 3write~~writes 4 writes~~write I rarely空格game shows,but my husband always空格them. 1watch~~watches 2watchs~~~watches 3watches~~watch ~~~JILL usually空格thenewspaper in the mornin. Her children空格it at night ~~1read~~reads 2reads~~read 3reads~~reads ~~~~~ HOW often do you read magazines? I read 空格 every day . 1 them 2 it 3 you 以上几个题 我不明白 高手帮帮忙 尤其是 1 2 3题 这类我一弄就晕 如何分辨呢? 希望高手解答 麻烦您把答案写下 ~~谢谢
baby1ing1年前4
gzy1020 共回答了20个问题 | 采纳率80%
3121 主语是第一人称的话用动词原形,比如i 和we作主语,解释成"我/我们/他们怎样"这一类的就是第一人称.相反,像是"她/他/它怎样"就是第三人称单数形式,加s或es或用过去式也是可以的.举例:第一人称:I/we /They look at the picture.第三人称:She/He looks at me.你的前三道题都是这个问题.最后一道题是magaziner,是复数形式,所以用them,要是题中是magazine的话就选it了:-) 我很够意思吧!
各位会微积分和线性代数的大神帮帮忙吧~江湖救急啊~
各位会微积分和线性代数的大神帮帮忙吧~江湖救急啊~
某厂生产某种产品q件时的总成本函数为c(q)=20+4q+0.01(q的二次方)元,单位销售价格为p=14-0.01q(元/件),问产量为多少是可使利润达到最大?最大利润是多少?
五子醉1年前1
我已被你宠坏 共回答了16个问题 | 采纳率100%
π=pq-c=14q-0.01qq-20-4q-0.01qq
=-20+10q-0.02qq
π‘=10-0.04q=0
q=10/0.04=1000/4=250
产量为250时候,可使利润达到最大
最大利润是πmax=-20+2500-0.02*250*250=1230元
这是微观经济学的题目
十万火急,数学题,帮帮忙江湖救急:在△abc中,ab=ac,d在ab上,e是ac延长线上一点,且bd=ce,de与bc交
十万火急,数学题,帮帮忙
江湖救急:在△abc中,ab=ac,d在ab上,e是ac延长线上一点,且bd=ce,de与bc交于点f,求证:df=ef
红色的雪1年前2
kevin8848he 共回答了17个问题 | 采纳率94.1%
做DG‖AE,DG交BC于G
∵DG‖AE
∴∠DGB=∠ACB
又∵∠CGD=180°-∠DGB,∠BCE=180°-∠ACB
∴∠CGD=∠BCE
∵∠B=∠ACB,∠DGB=∠ACB
∴∠B=∠DGB
∴BD=GD
又∵BD=CE
∴GD=CE
又∵∠BFD=∠CFE
∴ΔDFG≌ΔEFC
∴DF=EF
江湖救急:单摆运动为什么在偏角θ很小时,sinθ约等于θ约等于x/l
江湖救急:单摆运动为什么在偏角θ很小时,sinθ约等于θ约等于x/l
是不是和高一下半学期的知识联系到一起了?
slslxa1年前1
又是一周 共回答了18个问题 | 采纳率88.9%
弧长近似等于振幅
江湖救急!谁有关于health的英文文章啊!
江湖救急!谁有关于health的英文文章啊!
大学水平的,1500-2000个单词左右!最好是比较适合于演讲的那一种!
xxrj1年前2
bzlhy 共回答了31个问题 | 采纳率96.8%
DESTIBY
理解你的急切心情,这是一篇难得的演讲稿,从健康的现代定义开始,然后讲到保持健康的重要性,最后提倡健康的生活方式,并且给出建议.结构清晰紧凑,希望能帮得上你忙.字数的删减你可以通过最后提倡的建议做适当的修改.
Healthy Living
Health,by definition,is a state of physical,mental and social well being.It implies the absence of infirmity or disease,but their mere absence does not define health.Earning and maintaining health is an active process.Good health is a result of proper nutrition,regular exercise,health care and hygiene.One of the most important factors determining the mental health of an individual is his/her happiness quotient.Hence,effective stress management forms a vital factor in remaining healthy.
Why is it Important to be Healthy?
Human beings are the most important assets of a nation.It is people who drive the world,it is we who make the world go round.The absence of health can make the world come to a standstill.Do I seem to be exaggerating?I am not.The absence of health can actually mean passivity,unhappiness and gloom.Would anyone like to live in a somber atmosphere?Would we be able to thrive in an unhealthy atmosphere?The true definition of health brings out the real essence of a healthy life.The concept of being healthy is a composition of different facets of life.It includes physical well-being,which can be brought about by a healthy diet and exercise; it constitutes the maintenance of health through proper precaution and cures for physical ailments.The conveniently ignored facet of being healthy is the mental well-being.One's happiness and positivism are highly influential in the maintenance of one's health.
Healthy Living Tips:Living a Healthy Lifestyle
Here are a few healthy living tips.They work for me.Maybe they will work for you.You should always find your own path to living the healthy lifestyle.
1.Everything should be done in moderation – eating,working,resting,playing,maintaining hobbies,socializing,and so on.
2.You should take stock of how you spend your day,so you can reschedule your time,concentrate on important chores,cut down on the inconsequential,and thereby suffer less stress.
3.Don't take on more work or personal responsibilities than you can realistically handle.
4.Do what you love.The money will usually follow.
5.Try to be less materialistic and keep your life simple.It is really unnecessary to keep up with the Joneses.Why buy a car if you can avail of public transport?Why own a cell-phone when you don't really need one?Why beat yourself up trying to upgrade to the latest software when the old one serves you just fine?
6.Pay all your bills regularly and on time.Never take a loan if you're not sure about meeting the monthly payments.Live within your means.
7.You should sleep for at least eight hours every night.A siesta in the afternoon,if possible,is also a good idea and certainly refreshing for your brain.
8.Control your mind.What you think and how you think affects your general well-being.Refuse to entertain negative or self-derogatory thoughts and emotions.This will require practice,especially if you have fallen into the habit of seeing the glass half-empty.
9.Cultivate your spiritual side.You don't have to turn religious and burn candles at public altars,but keeping in touch with your intuition and your inner self is important.
10.Go for comfort over fashion any day.
11.Eat well and healthy.Learn to cook well.Try new recipes.Make meals interesting and fun.
12.Exercise regularly.Go for a short run every morning.Do Yoga.Exercise your eyes regularly,especially if you spend a lot of time in front of the computer.If you have to run errands around the neighborhood,walk or cycle around.Walk up stairways instead of taking the lift.
13.Go for regular medical check-ups.If you have health problems,talk to your doctor and discuss all the options that are available for you.Get a second,third,fourth opinion.Research on the Internet.Don't panic,lose hope,or give up easily.
14.Read books,magazines,newspapers.Be aware of what is going on around you,locally,nationally,and internationally.Try to learn at least one thing new every day.
15.Don't take yourself too seriously.Learn to laugh at yourself.
16.Don't indulge in malicious gossip.
17.Pay attention to the thing that
you're doing at any given moment,and do it well.
江湖救急:帮我写下英语作文、、准备交卷了额.
江湖救急:帮我写下英语作文、、准备交卷了额.
请你以学生会的身份,写一份有关即将再本校举办2012年英语夏令营活动的书面通知,内容如下:
时间七月二十九日至八月一日 地点学校礼堂
内容:1演讲、辩论;2谈学习英语的经验;3师生英语晚会;4游览市容
要求:1欢迎广大同学踊跃参加夏令营活动;2活动后写一篇日记,谈谈你的感想
词数再80~100个左右
.
wojiushiaini1年前1
沉吟风 共回答了27个问题 | 采纳率88.9%
June 6,2006
Dear students,
The English Summer Camp will be held in the school hall from July 29 to August 1. Many interesting activities are waiting for you to join in.
During the camp,you can give a lecture and have a debate. Besides,the students who do well in English study will talk about their experience. There is also an English party between teachers and students. In the end,you’11 have a chance to visit the City of Tianjin.
Everyone is welcome to take an active part in it. Don't forget to tell us what you think of the camp in your diary. Students’ Union
江湖救急.英语作文 假如你是李华,英国学生peter去年来你校学习,一年学期满准备新年
江湖救急.英语作文 假如你是李华,英国学生peter去年来你校学习,一年学期满准备新年
英语作文 假如你是李华,英国学生peter去年来你校学习,一年学期满准备新年回国,请你代表全班同学写一篇欢送辞.内容包括1,同学关系融洽.2英语学习氛围更浓,3保持联系,欢迎再来.(100词左右.)救急必粉
p1914848581年前1
fljghosdk 共回答了17个问题 | 采纳率94.1%
Dear friends,
Today we are having a party to honor our friend Peter, who is returning to his own country with his parents. How time flies! It was a year since he came to our school. During this period, we have helped each other and thus have become good friends. What's more, many of us have become more interested in English and have made great progress in it.
We all hope that when he returns to his homeland, he will get in touch with us as often as possible. We also hope that he will come to China again some day. Good luck, Tom. And good luck to your family. May you have a pleasant trip home! Thank you.
江湖救急!|x-1 |< |2x-3 | 求x (1+x/3)(x²+1)>(1-x-2/2)(x²
江湖救急!|x-1 |< |2x-3 | 求x (1+x/3)(x²+1)>(1-x-2/2)(x²+11)
|x-1 |< |2x-3 | 求x
(1+x/3)(x²+1)>(1-x-2/2)(x²+11)
xianan19851年前1
メ落泪胡一刀 共回答了15个问题 | 采纳率93.3%
1.两边同时平方,然后往下做就可以了
x²-2x+10
x2
2.第二题分别乘出来就可以了
(6+2x)(x²+1)>(12-3x)(x²+11)
江湖救急,超难题~快中慢3辆车同时从一地点出发,沿同一条公路追赶前面一个骑车人,速度都保持不变,这3辆车分别用了6分钟,
江湖救急,超难题~
快中慢3辆车同时从一地点出发,沿同一条公路追赶前面一个骑车人,速度都保持不变,这3辆车分别用了6分钟,12分钟追赶上骑车人,现在知道快车每小时行24千米 ,中车每小时行20千米,慢车每小时行多少千米?
lkj707281年前3
557768 共回答了16个问题 | 采纳率87.5%
快车追上时跑了 24*6/60=2.4千米
中车追上时跑了 20*10/60=10/3千米
这4分钟里自行车跑了 10/3-2.4=14/15千米
自行车的时速 (14/15)/(4/60)=14千米/每小时
3辆车追赶前,自行车先行了 2.4-14*0.1=1千米
慢车追上自行车时自行车跑了14*12/60+1=3.8千米
慢车时速 3.8/(12/60)=19千米每小时
江湖救急!马上要交作业了,大神快点要有过程啊!!!
江湖救急!马上要交作业了,大神快点要有过程啊!!!
空集合A={x|2a+1≤x≤3a-5},B={x|3≤x≤22},则能使A包含(A∩B)成立的a的值的集合
sbokli1年前0
共回答了个问题 | 采纳率
江湖救急!优化大考卷英语答案阶段质量检测(十三),高三人教版,除听力和作文外.江湖救急!
room虫1年前1
wxlwillwill 共回答了17个问题 | 采纳率94.1%
单选14134 14333 11134
完形24231 33221 42213 43124
阅读4233 1134 2112 1324 2413
江湖救急!请选择对答案把握比较大的题目回答,当然能全部回答最好,不过正确率为先~1.氧化镁 是否是和氧化铝一样的 致密
江湖救急!
请选择对答案把握比较大的题目回答,当然能全部回答最好,不过正确率为先~
1.氧化镁 是否是和氧化铝一样的 致密 氧化膜?
2.氧化钠、氧化钙 分别与 二氧化碳气体 化合的反应条件是什么?
3.如何除去 碳酸钠 与 碳酸氢钠 固体混合物 中的 碳酸钠
4.加热 碳酸氢钠 到没有气体放出时 剩余物质 中是否包括 水
5.离子反应发生的 条件 是什么?(是条件而不是定义)
6.为什么 焦炭与氧化铁 在高温下生成 二氧化碳气体 而 焦炭与二氧化硅 在高温下却生成 一氧化碳气体 另外这两个反应发生的同时是否伴随着 焦炭与二氧化碳在高温下生成一氧化碳的反应 的进行?一氧化碳在高温下能否还原二氧化硅?
7.硅是一种亲氧元素,为什么单晶硅在常温下化学性质不活泼,不与氧气反应?
8.列举实验室中除氢氧化钠外不能用 玻璃塞 盛装的物质?
PS:已知数列{a『n』)}中,a『1』=2,a『n+1』=(a『n』)^2 + 2*(a『n』),求通项公式a『n』.简略点的也行)
跪谢!
第三题大家的答案都很一致,可是题目中是固体混合物,若要通二氧化碳则需先溶解,溶解后再蒸发时会有部分碳酸氢钠因加热重新变成碳酸钠,所以对此尚有疑问,
另外第五题所说的是离子反应的条件,并非定义或复分解反应,yirenrenren好像比较符合题意,但能否稍作解释,看不是很懂……谢谢!
第七题如果按照大家的解释,请问为什么自然界中不存在单质硅?
飞飞不简单1年前1
1940815 共回答了17个问题 | 采纳率82.4%
1.是的 2.氧化钠不需加热,但是通常情况下,氧化钠与水反应更快,所以若把氧化钠放在空气中它会先生成氢氧化钠,再由氢氧化钠与二氧化碳反应,
氧化钠也可直接与二氧化碳反应Na2O+CO2=Na2CO3 ,后者需高温 3.通过量的二氧化碳 4.碳酸钠 无水 5.反应物之一能电离出离子,且满足复分解反应的条件、氧化还原反应的条件等,即要客观的能发生化学反应,反应能发生.6.三价铁的氧化性远强于四价硅,是伴随着的,co当然可以还原SiO2 .7.硅是原子晶体,硅与硅的化学键能大 8.氢氧化钾、碳酸钠、碳酸钾、硅酸钠、酒石酸钠等 9.1+a(n+1)=(an+1)∧2 令bn=.1+a(n+1) b1=3 b2=3∧2 b3∧4.
bn=3∧2的(n-1) 然后自己在变形即可得答案.
江湖救急!数列{an}{bn}都是等差数列,a1=0,b1=-4,用Sk,Sk'分别表示数列{an}{bn}的前k,k'
江湖救急!
数列{an}{bn}都是等差数列,a1=0,b1=-4,用Sk,Sk'分别表示数列{an}{bn}的前k,k'项和,且Sk+Sk'=0,则ak+bk=?
smartlala1年前2
354266733 共回答了21个问题 | 采纳率100%
{ak+bk}是以a1+b1=-4为首项的等差数列
所以Sk+Sk'=k(-4+ak+bk)/2=0
所以ak+bk=4
“求你不要再折磨我了,我真的很烦”用英语怎么说?亲们~“江湖救急”啊!
华山论剑之一1年前4
不下线 共回答了21个问题 | 采纳率100%
Please don't torture me,I'm really annoying
江湖救急!黄先生4月份缴纳个人所得税税金155元,那么黄先生该月的工薪是------元
江湖救急!黄先生4月份缴纳个人所得税税金155元,那么黄先生该月的工薪是------元
依法纳税是每个***应尽的义务,新的《***共和国个人所得税法》规定,从2011年9月1日起,***全月工薪不超过3500元的部分不必纳税,超过3500元的部分为全月应纳税所得税额,此项税款按下表分段累进计算.黄先生4月份缴纳个人所得税税金155元,那么黄先生该月的工薪是------元
不超过1500的部分 3%
1500至4500的部分 10%
..
lovesieg1年前3
renzhe0406 共回答了19个问题 | 采纳率89.5%
如果工资额刚好比3500元高1500元,那么应缴:1500*0.3=45元
如果工资额刚好比5000元高3000元,那么应缴:3000*0.1=300元,
很显然工资面议超过8000元,那么总税额155-45=110元,即超出5000元的部分按0.1缴了110元.
110/0.1=1100元
即总工资为3500+1500+1100=6100元.
我说清楚了吗?
请问谁知道有英语分类词汇书?江湖救急
sk4461年前3
乡梦不曾休 共回答了19个问题 | 采纳率100%
有 新东方有 词以类记 我买的是托福词汇的词以类记,别的等级英语也有好像~去新东方的大愚书店,或者别的书店,或者网上都应该有卖的.
江湖救急,为增加绿地面积,现将停车场铺设边长25厘米的正方形实体砖,更换为通透形地砖.通透形地砖就是在原地砖的四边挖去4
江湖救急,
为增加绿地面积,现将停车场铺设边长25厘米的正方形实体砖,更换为通透形地砖.通透形地砖就是在原地砖的四边挖去4个相同的半圆,这半圆直径10厘米.如果在挖去的部分栽上草,999块这样的通透形地砖铺设好后能增加多少平方米的绿地?
为啥不用25厘米?
musicradiotianya1年前1
漂泊泉城 共回答了15个问题 | 采纳率80%
{[(10/2)*(10/2)*3.14]/2}*4*999/10000
半径的平方*圆周率=圆的面积;因为是半圆 所以除以2;
有4个半圆 所以 *4 ;有999个砖 就*999; 把平方厘米 换成平方米 所以 除以10000
结果约=0.156平方米
题上说的25厘米 是表示 你画4个半圆 将没有交点
就不会有重复被换掉的砖
江湖救急,第14计算题,
江湖救急,第14计算题,

大灰小白1年前1
猪猪酒窝 共回答了15个问题 | 采纳率86.7%
江湖救急啊,快来!已知a+3b=-2,求a²+2a-6b-9b²的值
江湖救急啊,快来!
已知a+3b=-2,求a²+2a-6b-9b²的值
dopod1年前2
过尽-千帆 共回答了17个问题 | 采纳率70.6%
=(a-3b)(a+3b)+2a-6b
已知a+3b=-2
=-2(a-3b)+2a-6b
=0
阅读短文,根据首字母补全单词(高手们快来啊,江湖救急啊)
阅读短文,根据首字母补全单词(高手们快来啊,江湖救急啊)
in china if you are seven ,you have to go to school.at school you learn different (s ).(S ) is one of them.we have three science classes a (w ).they are on tuesday,(w )and friday.we can learn a (l ) in science classes .mr jin is our science teacher.he wasn't born here.he is from another big (c )named haikou.he is a (b ) teacher before.he knows much about plants.for (e ),when is the best time to water flowers.heis very (s ) with us.after science classes,we are so (t ).
hichannel11年前2
laizhiyou8 共回答了20个问题 | 采纳率90%
sujects
Science
week
Wednesday
lot
city
biology
example
strict
tired
江湖救急 求 中翻英美容方面的单词
江湖救急 求 中翻英美容方面的单词
急求下列中文词组的英文翻译,谢谢每一个给我答案的朋友们
1:价目表 2:全身油压 3:精油开背 4:泰式按摩 5:精油***
6:水晶泥*** 7:牛奶花瓣*** 8:中药*** 9:全身经络按摩 10:扦脚 11:耳烛 12:火罐 13:采耳 14:套餐 15:*** 16:套餐限每周一到周五18点前,请知道朋友帮个忙,不全的也可以.
Viki希希1年前2
突如其去 共回答了22个问题 | 采纳率90.9%
1:Price List 2:general hydraulic 3:Oil back open 4:Thai massage 5:Oil foot 6:Crystal mud foot 7:milk petal foot 8:Chinese medicine foot 9:body massage Meridian 10:Qian feet 11:ear candling 12:Cupping 13:14-ear:Package 15:foot 16:Packages limit every Monday to Friday before 18:00
绝对正确
江湖救急!谁有高等数学(上下册)的知识点结构图 同济大学数学系编的 只有上册也行
fjxmwxh1年前1
mark_javabean 共回答了22个问题 | 采纳率100%
我有公式定理大全,你要吗?
江湖救急,一篇关于空调不制冷的原因及分析的论文,3000字以上!
江湖救急,一篇关于空调不制冷的原因及分析的论文,3000字以上!
实习生,没什么分,抱歉!
条件允许的话,可以给个网站链接,或是在网站找到了复制粘贴给我!
花尖游1年前4
fishermao 共回答了12个问题 | 采纳率91.7%
o(∩_∩)o...
请参考我司网站、里面有家用电器和空调的销售和维修实例、希望你就借鉴一下、自己书写、希望能帮到你!
www.***.com
应用文写作主体的能力包括?江湖救急.
应用文写作主体的能力包括?江湖救急.
题目是这样的.应用文写作主体的能力包括()()()().这是填空题.有四个空格填写.跪等.ORZ
我爱没事没事爱我1年前1
虾酱月亮 共回答了22个问题 | 采纳率90.9%
写作主体
逻辑思维 :人们在认识过程中借助于概念、判断、推理等思维形式能动地反映客观现实的理性认识过程,又称理论思维.它是作为对认识着的思维及其结构以及起作用的规律的分析而产生和发展起来的.只有经过逻辑思维,人们才能达到对具体对象本质规定的把握,进而认识客观世界.它是人的认识的高级阶段,即理性认识阶段.
观察 :细察事物的现象、动向
结构与功能相适应规律
公文:公文,在古代指的是处理或联系公务的文件,而在现代一般指行政机关、社会团体和企事业单位在行政管理活动或处理公务活动中产生的,按照严格的、法定的生效程序和规范的格式制定的具有传递信息和记录作用的载体文件.公文一般格式较为正式,内容比较规范,并且有行政机关赋予的特定的效能和影响力.
江湖救急-翻译-需要准确一些的-急等30分钟
江湖救急-翻译-需要准确一些的-急等30分钟
1. FlexEfficiency* 50
2. Flexible Thermal Generation
3. place a value on “flexibility” and include it in economic evaluation of
future generation additions
4. How important is flexibility in gas turbine and combined cycle thermal generation and how can this help variability?
5. How will gas turbine and combined cycle generation be different, specifically in the number of hours they will be needed to operate?
6. How do you see variability and intermittency impacted as the electrical grid changes and more renewables are introduced?
请提供专业点的回答,用软件直接翻译我也会的。
maggie_cool1年前1
half盎司 共回答了16个问题 | 采纳率75%
1.FlexEfficiency * 50
2.柔性热发电
3.地方上的“灵活性”的价值,包括它的经济评价
未来一代增加
4.重要的是如何在燃气轮机和联合循环热发电的灵活性和可以如何帮助变异?
5.如何将燃气轮机和联合循环发电是不同的,特别是在对他们将需要更多的操作时数?
6.你怎么看变化和电网的变化和影响更多的可再生能源间歇性的介绍?
江湖救急!英语作文在线等.班里新来同学、一开始不喜欢他.认为他自私.粗鲁.但我生病后照顾我.感受是不要轻易对一个人做出判
江湖救急!英语作文在线等.
班里新来同学、一开始不喜欢他.认为他自私.粗鲁.但我生病后照顾我.感受是不要轻易对一个人做出判断 要求80词
ouzhe1年前1
langzi1201 共回答了10个问题 | 采纳率90%
Never judge a man by his appearance
A new classmate joins our class this semester.At the beginning, I don't really like him very much.My friend tells me that he is very rude and selfish.
One day, what happened changed my idea. I was sick in hospital and bored in bed,suddenly someone called my name.It is him.He has been in the hospital for several days and taken care of me.
After that, I know a saying:"Never judge a man by his appearance."
已知弧长,弦长,求半径是多少?已知弧长=35,弦长=20.求半径是多少?江湖救急!答对赏分!
江南才子朱1年前1
fenfeitianya 共回答了17个问题 | 采纳率94.1%
已知弧长C=35,弦长L=20.求半径R是多少?
Rn+1=(1+(L-2*Rn*SIN(C/(2*Rn)))/(L-C*COS(C/(2*Rn))))*Rn
R0=10
R1=10.122
R2=10.125
R3=10.125
R=10.125
江湖救急.英语达人.速进.1.Professor Li,many students want to see you.__
江湖救急.英语达人.速进.
1.Professor Li,many students want to see you.___________they wait here or outside?
A.Do
B.Will
C.Shall
D.Are
2.We____________try our best to meet the requirements.
A.will
B.must
C.can
D.shall
3.I wonder why the boat___________not be repaired at that time.
A.could
B.would
C.might
D.had to
4.Smoking__________be prohibited in hospitals.
A.shall
B.must
C.will
D.can
5.There was plenty of time.She____________.
A.mustn't have hurried
B.couldn't have hurried
C.mustn't hurry
D.needn't have
6.He__________not to go on like that.
A.should
B.had better
C.ought
D.can
7.He_________TV now.For the exam is just around the corner.
A.may not be watching
B.may be watching
C.shall not be watching
D.will be watching
8.Where is my pen?I___________it.
A.might lose
B.would have lost
C.should have lost
D.must have lost
9.A computer__________think for itself,it must be told what to do.
A.can't
B.couldn't
C.may not
D.might not
10.I don’t think the construction_____________.
A.have been completed
B.may be completed
C.may have completed
D.may have been completed
11.They had to catch an early bus,____________they?
A.hand't
B.didn't
C.mustn't
D.needn't
12.He is wet to the skin.It_________ heavily.
A.must have rained
B.must rain
C.must be raining
D.may be raining
13.Why___________you always interrupt me?
A.can
B.will
C.may
D.must
14.He____________my good intention.
A.must misunderstand
B.must have misunderstood
C.should have misunderstood
D.would have been misunderstood
15.___________you come to dinner tonight?
A.Should
B.Won’t
C.Can’t
D.Mustn’t
16.__________ you come and have a little whisky?
A.Won’t
B.Wouldn’t
C.Don’t
D.Will
17.Who said that you__________take the book out of the room?
A.would
B.could
C.should
D.ought to
18.The group___________a new workable plan.
A.might be introducing
B.had to be introducing
C.introduces
D.was introduced
19.I told Sally how to get there,but perhaps I______ for her.
A.had to write it out
B.must have written it out
C.ought to write it out
D.should have written it out
选择错误1年前1
ieba 共回答了14个问题 | 采纳率92.9%
CDBAD
BCAAA
BCDAB
ABCA
希望楼主以后把正确答案发出来
一篇关于英文的日记。快江湖救急啊。答对给好评。
神飞1年前1
hnslajsfl 共回答了1个问题 | 采纳率100%
什么主题
江湖救急 函数已知直线y=kx+b在平行于直线y=-3x+4,且与直线y=2x-6的交点在x轴上,求此一次函数的解析式已
江湖救急 函数
已知直线y=kx+b在平行于直线y=-3x+4,且与直线y=2x-6的交点在x轴上,求此一次函数的解析式
已知函数y=kx+b,当x增加2时,y减少3,求k
yellow991年前1
yanjian2 共回答了16个问题 | 采纳率93.8%
(1)因y=kx+b平行于直线y=-3x+4,故斜率相等,k=-3
又因为与直线y=2x-6的交点在x轴,即y=0,故交点为(3,0)
将(3,0)代入y=-3x+b,得0=-9+b,故b=9
解析式y=-3x+9
(2)根据已知x增加2时,y减少3,可知斜率=△y/△x=-3/2
所以k=-3/2