一1 2 一3 4 一5 6 一7 8 一9 10 一11
![](images/u2507.png)
一1 2 一3 4 一5 6 一7 8 一9 10 一11
一1
2 一3 4
一5 6 一7 8 一9
10 一11 12 一13 14 一15 16
按照上述规律排下去,那么第10行从左边数第9个数是( ),数一201是第( )行从左边数第( )个数.
一1
2 一3 4
一5 6 一7 8 一9
10 一11 12 一13 14 一15 16
按照上述规律排下去,那么第10行从左边数第9个数是( ),数一201是第( )行从左边数第( )个数.
已提交,审核后显示!提交回复
共1条回复
nutslyx 共回答了18个问题
|采纳率88.9%- 按照上述规律排下去,那么第10行从左边数第9个数是( 90 ),数一201是第( 15 )行从左边数第( 5 )个数.
最中间那排数全是负数,分别为-1,-3,-7,-13.,-[n(n-1)+1],n为行数
每一行数的个数为:2n-1
利用这两个规律就不难求出了. - 1年前
相关推荐
- 14/25一1/3➗(4/5+1/4)
沧海狂风1年前1
-
启军003 共回答了8个问题
|采纳率87.5%14/25一1/3➗(4/5+1/4)
=14/25-1/3×(16/20+5/20)
=14/25-7/20
=56/100-35/100
=21/100;1年前查看全部
- 4X+2=5X一1 X=?
sdjfgklaewgrkth1年前0
-
共回答了个问题
|采纳率
- 4x²一3x一1=0
Syususyou1年前0
-
共回答了个问题
|采纳率
- 一1+2a一a^2怎样因式分解
coldcoldplay1年前1
-
BOBzjj 共回答了18个问题
|采纳率100%一1+2a一a^2
=-(1-2a+a^2)
=-(1-a)^21年前查看全部
- 一1 Mr liu there is a () for you at the school gate 2 Lucy is
一1 Mr liu there is a () for you at the school gate 2 Lucy is a () student from America
3 The workers are going to () a new bridge across the river ( 前三个用括号内的单词并用其正确形式填空 build lady foreign) 二用适当的介词填空 1My aunt looks very young although she is () forty 2Wang Hong is good at writing and she often writes () the school newspaper 3 My counsin wants to find a job () a secretary in a big companyjulycln20071年前1
-
没有我的维拉 共回答了16个问题
|采纳率100%1.lady
2.foreign
3.build
1.over
2.for
3.as1年前查看全部
- 一1 I'd like a pizza _____ lemoncurd on it.A has B have C and
一
1 I'd like a pizza _____ lemoncurd on it.
A has B have C and D with
2 We eat _____ and _____ every day.
A onions,hot dog.B onions,hot dogs.C onion,hot dogs D onion hot dog
3 They have _____ potatoes,but they don't have _____ tomtoes.
A some,some B some,any C any,some D any,any
4 Is that ball large?
________
A NO,that's a small.B No,that's small one.C NO,it's small ball D NO,it isn't
5 Some oranges _____ in the box.Some pear juice _____ in the glass.
A is.is B are,are C is ,are D are,is
6 I'd like some noodles.what would you like_____the pizza?
A with B on C at D for
二
A:What can i do ____ you?
B:Yes,please.
A:____ you like a drink?
B:OK.
A:Which would you like ____ ,orange or tea?B:
B:Tea,_____ .I like tea better ____ orange.
A:Can I _____ some sugar and milk _____ it?
B:No,thinks.I like Chinese tea _____ nothing _____ it.
A:OK.Here you are.
B:Thank you.
A:It's my ______.砂之GOURD1年前2
-
法iiii 共回答了30个问题
|采纳率93.3%DCBDDB
for
Would
Better
Please than
put in
with in
pleasure1年前查看全部
- 4(2x一7)一2(x一1)=3(x一1)一2 x=?
最愤怒的女青年1年前0
-
共回答了个问题
|采纳率
- 7/15+[5/8一1/3]÷7/8
5hahahaha1年前1
-
tt军嫂网 共回答了15个问题
|采纳率80%1年前查看全部
- (x一1):23/5=0.1:23/5
cytc20061年前1
-
freemanhyao 共回答了15个问题
|采纳率93.3%X=1.11年前查看全部
- 化简5a一2a一2(a一3a)一1
tingchaoren1年前3
-
84665 共回答了23个问题
|采纳率91.3%答案是3a+4a-11年前查看全部
- 一1一2一3一...一1000
xugang3191年前0
-
共回答了个问题
|采纳率
- 2(3X一1)=5(X+2
石碟1年前2
-
anchaoanch 共回答了14个问题
|采纳率64.3%6x-2=5x+10 6x=5x+12 x=121年前查看全部
- 1/3x+16+(x一1/3x-16)x5/8+12=x求解过程
letmedie1年前1
-
心诗金 共回答了15个问题
|采纳率100%1/3x+16+(x一1/3x-16)x5/8+12=x
1/3x+16+(2/3x-16)x5/8+12=x
1/3x+16+5/12x-10+12=x
x-1/3x-5/12x=16-10+12
1/4x=18
x=721年前查看全部
- 3+(一1)+(一3)+1+(一4)过程 5/9+15/6+4/9+(一2)过程
神威殿1年前2
-
tony301606 共回答了3个问题
|采纳率来了1年前查看全部
- 一3平方+(一1)2001次方除以6/1+(一5)平方
longchamp1年前0
-
共回答了个问题
|采纳率
- 一1.The book provides us with a lot of ____________( value) i
一
1.The book provides us with a lot of ____________( value) information.
2.Remember not ___________(waste) or pollute me.
3.It is not healthy to eat too much _________ (salty).
4.Is it time for your father ________ (tell) stories to you?
5.__________ (have) a shower uses less water than having a bath.
6.These __________ (cook) are made in China.
7.— How many students passed the exam? — Only five of _______ (they).
8.Keeping quiet is one of the most important________ (rule) in the library.
9.Mr.Li can (speaker) English and Japanese.
二
10.It’s____________ (fool) of you to waste water and electricity.
1.Daisy likes to keep a diary to express her _____________ (feel).
2.Nobody can tell the ______(high) of the building.
3.Don’t stay out too late at night,or your parents will be_________(worry) about you.
4.Do you think the ______(sell) will sell the dress at 120 yuan?
5.My kite is flying _________(high) than yours.
6.Aunt Lee makes a (live) by working in a factory.
7.The man stopped (work) and went to have a rest .
8. (actual) ,they don’t know what happened at all.
9.It is interesting at the (begin) of the film.
10.Sometimes I saw stars shooting (bright) across the sky.小A_爱笔1年前1
-
魏显爝 共回答了19个问题
|采纳率78.9%正确答案为:
1 valuable
2 to waste
3 salt
4 to tell
5 Having
6 cookers
7 them
8 rules
9 speak
10 foolish
1 feelings
2 height
3 worried
4 seller
5 more highly / higher
6 living
7 working
8 Actually
9 begining
10 brightly
★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆1年前查看全部
- 4(2X一9)+3(X一15)=7(X一1)一2
zsgao1年前1
-
草草宝宝 共回答了15个问题
|采纳率100%8x-36+3x-45=7x-7-2
4x=72
x=181年前查看全部
- 因式分解:(1)3ax^2-3ay^.(2)(2X一3y)^一(3x一2y)^.(3)x^(y^一1)+(1一y^).(
因式分解:(1)3ax^2-3ay^.(2)(2X一3y)^一(3x一2y)^.(3)x^(y^一1)+(1一y^).(4)(X^一6)^一6(X^一6)+9..
jhao1年前2
-
DJKOE 共回答了18个问题
|采纳率88.9%(1)3ax²-3ay²
=3a(x²-y²)
=3a(x+y)(x-y)
(2)(2X一3y)²一(3x一2y)²
=[(2x-3y)+(3x-2y)][(2x-3y-(3x-2y)]
=(2x-3y+3x-2y)(2x-3y-3x+2y)
=(5x-5y)(-x-y)
=-5(x-y)(x+y)
(3)x²(y²一1)+(1一y²)
=x²(y²-1)-(y²-1)
=(y²-1)(x²-1)
=(y+1)(y-1)(x+1)(x-1)
(4)(X²一6)²一6(X²一6)+9
=[(x²-6)-3]²
=(x²-9)²
=(x+3)²(x-3)²1年前查看全部
- 一.根据实际情况回答问题?一1.What is the biggest animal on the earth 2.Is
一.根据实际情况回答问题?
一
1.What is the biggest animal on the earth
2.Is an elephant much smaller than a blue whale
3.What's you favourite eveht
4.Which fish can swim faster than most boats
5.How can people move as fast as animals and fish开心竹1年前1
-
pljingjing 共回答了21个问题
|采纳率90.5%1.Whale
2.Certainly
3.Auto race
4.Sailfish
5.Take car and boat or even rocket1年前查看全部
- (2x一1)平方等于多少
小妖谷神星张1年前0
-
共回答了个问题
|采纳率
- 英语翻译一1.The boy was worried because he did not catch the cat
英语翻译
一
1.The boy was worried because he did not catch the cat .
2.The playmate hit the vase with his arm.
3."Playmate"means here a child who plays with him.
4.The boy's father praised him.
5.The story tells us not to tell a lie when you did something wrong.
二
1.A farmer saw a dead snake on his way to the field.
2.The farmer picked the snake into his bag to warm it.
3.After gorwing warm,the snake thanked the farmer.
4.At last,the farmer died.
5.The story tells us not to take an enemy for a friend.
三
1.Mr Black went to the city to look for the old woman.
2.The old woman stopped Mr Black's car and showed the way to the hotel.
3.The old woman asked Mr Black to stop at her house.
4.The Sun Hotel was near the old woman's house.
5.Mr Black had to turn round and go back ten miles.
四
1.The students in the science class are growing plants.
2.Some students have been digging since this morning to build the green-house.
3.The bushes are smaller.
4.The student don't build a new greenhouse..
4.Some students are working to finish the new greenhouse.
五
1.The weather in that summer was very hot and I wasn't happy.
2.It took the writer two hours and a half to read English and Chinese.
3.The writer spent most of the afternoon swimming.
4.The writer began studying as soon as he got up.
5.The writer is a good swimmer now.
六、
1.Long ago,a few people could stay in one place,hunting animals for food.
2.When these people learned to grow food,their life changed.
3.Factories were built after cities grew big.
4.Some people don't like to live in big cities.
5.Everyone knows how and where cities began.clg3221年前3
-
opqist8898 共回答了16个问题
|采纳率81.3%一、
1小男孩因为没抓到猫有些闷闷不乐.
2.玩伴用手臂击打花瓶.
3.玩伴在这里指跟他一起玩的小孩.
4.男孩的父亲夸奖了他.
5.这个故事告诉我们:做错事时不要撒谎.
二
1.一个农民在去农田的路上看见一条死蛇.
2.这个农民把蛇放进口袋,使它暖和.
3.蛇得到温暖后,感谢(咬)了那个农民.
4.最后,那个农民死了.
5.这个故事告诉我们不要把敌人当作朋友..
三
1.布莱克先生去那个城市找那个老妇人.
2.老妇人停住了布莱克先生的车,展示了去旅馆的路.
3.老妇人让布莱克先生把车停在她家.
4.太阳旅馆就在老妇人家附近.
5.布莱克先生不得不调头,往回走十英里.
四
1.在上科学课的同学正在种植植物.
2.一些学生从早上就开始挖坑来建造温室.
3.小树苗很小.4.这个学生不能建新的温室.
4.一些学生正在忙着完成这个新的温室.五
1.那个夏天的天气很热,我不是很高兴.
2.读《中英》这本书花了这个作者两个半小时.
3.这个作家花了大半个下午来游泳..
4.这个作家一起床就可是学习.
5.这个作家现在是个游泳好手啦.
六、
1.很久以前,一些人一起呆在一个地方,以打猎为生.
2.当这些人学会了种食物,他们的生活改变了.
3.城市变大了以后,工厂建立起来了.
4.一些人不喜欢住在大城市.
5.每个人都知道城市是怎样以及从哪儿开始的.1年前查看全部
- 一1 Getting up early inthe morning is a good way to keep he__
一
1 Getting up early inthe morning is a good way to keep he___
2Se___ from the top ,the 2008 Olympic Stadium in Beijing looks as if it is covered by a gray net of steel.
3 Mary sh___ a room with her sister when she was young.
4 In his sp___ time ,Tom often helps his father with his houseword.
5 I pa___ a lot of money for this sweater yesterday.
6 Can you do me a fa___ to open the box.
7 It is reported that Pluto has been excluded ,which means there are only eitht pl___ now.
8 The population of China is la___ than that of any other country .
9 Be careful when you are cr__ the busy street.
10 We enjoyed ou___ in the Winter Vacation.
二
1 I don't want to go to the concert tonight ,I'll stay at home in___
2 I will go abroad next month ,so I'm busy le___ English these days.
3 We have no ch___ but to stay at home on such a rainy day.
4 Have you been to Beijing ,the capital of Ch___.
5 It's so hot in the room.Please keep the door op___.
6 We should consider it our duty to pr___ the environment around us.
7 If you look th___ the newspapers,maybe you will find some jobs that suit you.
8 The more you read ,the be___ your English will be.
9 We___ is the fourth day of a week .
10 My grandpa is already in his ei___,but he is still very healthy.盗_版1年前5
-
datouyuan 共回答了20个问题
|采纳率100%一
1,healthy
2,searching
3,shared
4,spare
5,paid
6,favour
7,planet
8,larger
9,crossing
10,ourselves
二
1,instead
2,learning
3,choice
4,China
5,open
6,protect
7,through
8,better
9,Wednesday
10,eightieth1年前查看全部
- 28减去一1等于多少?
海南盛之业1年前1
-
尉蔚的美妙心事 共回答了16个问题
|采纳率93.8%28-(-1)=28+1=291年前查看全部
- 1.已知A=一2xy²,B=一1/4x³+x²y-3xy²-1/6y³
1.已知A=一2xy²,B=一1/4x³+x²y-3xy²-1/6y³,求A³B.
2.设m²+2m+1=0,求m³+2m²+2008的值.
3.梯形的上底长为(4n+m)厘米,下底长为(2m+5n)厘米,高为(9n+3m)厘米,求此梯形的面积.江河护海1年前2
-
laijili 共回答了14个问题
|采纳率92.9%A^3B=(-2xy^2)^3(-1/4x^3+x^2y-3xy^2-1/6y^3)
=(-8x^3y^6)(-1/4x^3+x^2y-3xy^2-1/6y^3)
=2x^6y^6-8x^5y^7+24x^4y^8+4/3x^3y^9
m^3+2m^2+2008=m^3+2m^2+m-m+2008=m(m^2+2m+1)-m+2008=2008-m
从已知条件,可以求得:m=-1
所以,所求式子的值为:2008-m=2008-(-1)=2009
根据梯形面积公式得:梯形的面积为:
1/2[(4n+m)+(2m+5n)](9n+3m)=1/2(9n+3m)^2=81/2*n^2+9/2*m^2+27nm1年前查看全部
大家在问
- 1两道简单的数学题(要有过程)1、一水池装有甲、乙、丙三个水管,甲、乙是进水管,丙是放水管,分别单独开放甲、乙水管个需45
- 20.6 比值是?快
- 3(x+1)的绝对值-(x-1)的绝对值>(3/2).用绝对值的几何意义解题.
- 4用:如同……如同……如同……造句
- 5大长方体长30宽20高15.小正方体棱长10厘米,如果把它们熔铸成一个圆锥,这个圆锥的底面积是50平方厘米,高是多少?
- 6如图所示,MN是空气和玻璃的分界面,一束光线斜射到界面MN时, 在O处发生了反射和折射的现象,分析可得,入射角等于___
- 71/2,3/5,5/10,7/17,9/26,第N个数字是?
- 8什么是文章脉络
- 9如图1所示,木块的长度是______cm;
- 10学校图书馆买了甲乙两种书,甲每本19元,乙每本11元,两本书共花16元花去280元,这两种书各买了几本
- 11若a的平方+a的平方b的平方-4ab+b的平方+1=0!
- 12关于做一个善于合作的人的名言警句和事例
- 13人间鲁迅阅读题(1)指出下列语句在文章中的具体含义;用自己的语言A.“召引了大群年轻的奴隶”B."铺垫与厚饰“(2)为什
- 14雨下的特别大.怎么改为比喻句?
- 15写一篇关于快乐暑假的作文450字