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V=1/3Πh(R^2+2rR+r^2).请问h前面的是什么东西代表什么? 铁杵磨成针造句要两个句子, they remember people's birthdays;and they pay their bills as soon as the bills arrive.帮忙给我写出句子中的词组啊 do you think it necessary to do my homeworkDo you think it necessary to do my homework为什么不是Do you think it is necessary to do my homework Do your best to help her.(改为同义句)____ help her. please e-mail me those professors' weekly reports as soon as possible 怎么译? It's a dream,only a dream的意思 myself是神马意思? 几何,代数,h=1^2+1^2分之-1+0-4=√2分之51^2+1^2这是什么意识-1+0-4这又是什么意识AX+BY-C=0难道A-1+B0-4是什么意识-1+0-4除1^2+1^2 是什么意识啊 在一个什么是绝对值啊 几何 几何.数学,亲告诉我好吗y-2/-3-2=x-0/3-0为什么是5x+3y-6=0比如 (y-2/-3-2)-(x-0/3-0)=(3y-6/-15)-(3x/9)=0 不管算都不等5x+3y-6=0亲 请问下 这些代数的转换 是初中那里的基础 怎么没有啊看到好多AX-BY-C=0好多初 检查一下 数学几何认真点 在矩形ABCD中,AB=20cm,BC=4cm,点P从A开始沿AB边以4cm的速度移动.点Q从C开始沿CD边以1cm的速度移动.如果点P和点Q分别从A和C出发,当P到达B时,两点都停止运动.设运动速度为S,t为何值时,四边形APQD为矩 Except that when I popped out they decided at the last minute that they really wanted a girl.decide 后面不是should do用动词原型吗 Why didn‘t you tell me?I ____ tell you .A ,do B,did C,am D,are Children should have free time[ ](relax)at school要写原因 Children should have free time __(relax) atChildren should have free time __(relax)at school.We will meet Mrs.wang if It __(not rain)tomorrow. （高中数学）已知数列{an}满足a1=3,an+1（n+1是脚标）=2an（只有n是脚标）+1,求数列的通项公式.我知道大概步骤,就是将式子化为an+1 +1=2(an+1).进而用累乘法求答案的.an +1 =2（an-1 +1）,an-1 +1=2（an-2 节选的这几段文字中,奥楚蔑洛夫对狗的态度有几次变化?原因分别是什么? 1、奥楚蔑洛夫在处理狗咬人事件上反复改判了几次?都是怎样判的?2、奥楚蔑洛夫不断变化的依据是什么?3第三题这个 3、奥楚蔑洛夫身上有没有始终不变的东西？我现在就要 5分钟之内给我 求一篇关于通讯报道的作文,要有关于同学的!600字,急. AD为△ABC的中线,∠ADB的平分线交AB与点E,ADC的平分线交AC与点F,ED=DN,求证 BE+CF>EF 一道初三的几何题.拜托了~我真的不会.谢谢 you___succeed if you keep up your good work Amust Bwill be sure to Cmust be able Dare sure to选哪一个,为什么? I'm sure I（）（）（）（） the exam.我确信我能通过这次考试.用be able to do sth仿写 捕蛇者说表达作者目的话原文中 Don't you let me go baby Don't you let me down you never say god l'm sure he will come____.He will win ____prize.A first,first B the first,the first C the first,first Tom ang his parents_________(arrive)in Beijing in three days,aren't they?are ariving为什么不能用are going to arrive?并说明in three days的用法及意义! Tom got up early to take the early bus转换Tom got up early( )( )( )take the 小学郑人买鞋的翻译 英语翻译全文翻译啊