美女们,帅哥们.我有一道数学判断题 ,求求了!

90角

林冲

幸福的小黄鸭

我晕了、
你还是五年级的学生吗?、
就快升六年级还这么笨、
我能告诉你答案、
但是、
你记住
下次、
这么简单的问题、
你不能这样依赖网络、
3、帮火星写一篇自我介绍.
大家好,我的名字是火星,我与别的星球不一样,我很奇特的,你们一定没见过我吧,我的语言和别的星球完全不一样,我的字体也和别的星球不一样,我将所有星球的习惯、习俗、传统都改装过,所以呢,我觉得我是这个宇宙中最伟大的,我永远爱我自己,
6、生活中的水形态各异,各不相同.给下列“水”加上适当的修饰词.
（晶莹）的雨水
（滚烫）的开水
（咸咸）的海水
（清凌凌）的湖水
（澄澈）的溪水
（冰爽）的河水
（美丽）的（蝴蝶）
（清晰）的（湖面）
我只能帮你回答这两题、你实在太笨了、我们大家都是五年级的学生呀、

不好意思
心有余而力不足,根号我不会打
描述的确很烦.

∵x²-y²=4
∴（x-y)²=x²-2xy+y²=4-2xy
（x+y)²=x²+2xy+y²=4+2xy
∴（x-y）²-（x+y）²=4-2xy-(4+2xy）=-4xy

eautiful ladies
beautiful girls

设三轮x辆
3x+2(20-x)=45
3x+40-2x=45
3x-2x=45-40
x=5
自行车 20-5=15辆
如还有新的问题,请不要追问的形式发送,另外发问题并向我求助或在追问处发送问题链接地址,

mind doing sth.try to do .try doing ,tell from ,talk about ,make sense
make up ,make believe make的短语太多了

在网上查

第一题 5×（2x-7)＝3（3-2x）10x-35＝9-6x16x＝45x ＝2.75第二题3×（3x-1）-12＝2（2x+1）3x-3-12=4x+2-x=17x=-17第三题2x-3-（x-4）=22x-3-x+4=2整理 得 x=1第四题10x-5（x-1）=20-2（x-3）10x-5x+5=20-2x+67x=21...

我，荆轲，一个普通老百姓。只不过比普通人多了点运气，但没想到我代替天下去惩戒暴君秦王。嘻嘻，再来点呗！走在那悠长悠长又寂寥的路上面对这个黑暗又封建的地方，曾想不得罪任何人，忍受夸下指辱，三餐不包的日子。经过多少历尽风雨沧桑，无数转折，我来到了燕国。。。。。。哦哦嗯嗯...

Big big world

找关键字啊

Ladies and gentleman

百度吧还是

产生的热量是因为 固体的 氢氧化钠溶入水中,所以会产生的大量的热
而 氢氧化钠 和 硫酸铜 反应生成 氢氧化铜,但最终氧化还原反应生成 氧化铜
NaOH + CuSO4 ———— Cu(OH)2 + Na2SO4

1.“Go and post the letters,” the manager said to him.
　The manager _told_ him _to_ _go_ and post the letters.
2.“I will take it home with me.” she said.
She said that _she_ _would_ _take_ it home with _her_.
3.Theteacher said,“The sun rises in the east and goes down in the west.”
The teacher said that the sun _rises_ in the east and _goes_ down in the west.（真理不改成过去式）
4.She said,“Are you from the south?”
　She asked _whether_ I _was_ from the south.
5.Mom said to me,“Don't tell a lie.”
　Mom _told_ me _not_ _to_ tell a lie.
6.Mr Paul said to us,“Light travels faster than sound.”
　Mr Paul _told_ us that light _travels_ faster than sound.
7.Susan said to me,“We will visit the farm next week.”
　Susan told me that _we_ _would_ _visit_ the
　farm _a_ _week_ _later_.
9.He said,“You can sit here,Jim.”
He _told_ Jim that he _could_ sit there
10.He asked,“How do you find it,mother?”
He asked her mother _how_ _to_ _find_ it.
11.“Where are you these days?” he asked.
He asked me _where_ _was_ _I_these days.
12.“Do you know where she lives?” he asked.
He asked _if_ _I_ knew where she _lived_.
13.“Stop making so much noise,children.” he said.
He _ask_ the children _to_ _stop_ making so much noise.
14.“Don’t tell him the news.” she said.
She told me _not_ _to_ _tell_ him the news.
15.“Are you interested in this?” he said.
He _asked_ _if_ I was interested in _that_.
16.“I'm glad to get your e-mail.” He said to me .
He said _he_ _was_ _very_ glad to get _my_ e-mail.
17.e said to me,“Are you going home on weekend?”
He asked me _if_ _I_ _was_ going home on weekend?
18.“How do you like the food here?” She said to the boy.
She asked _the_ _boy_ _how_ _ he_ _ liked_ the food here.（格子数量不一样）
She asked _whether_ _he_ _liked_ the food here.（格子数量正好）
19.He said to me“Don't ride in the street.”
He told me _not_ _to_ _ride_ in the street.

① [（2-5x）/6 ] - （x/3）=1
等号两边都×6 得2-5x-2x=1
②3×5%+2%（x-1）=43%
等号两边都×100得15+2x-2=43
③ [2（x+1）+1 ] /3 - [ 2-3（x+1）] / 4=x
等号两边都×12得4[(2x+1)+1]-3[2-3(x+1)]=12x 即8x+8+3+9x=12x
5x=-12
x= -12/5