helping+in+emergencies

朱饼馥1590this+i s+m e+in+the+Ni agara+Falls怎么改错this+i s+m e+in+the+Ni aga ra+Falls怎么改错this+i s+m e+in+the+Ni aga ra+Falls怎 么 改 错 -
毛胖固18877268348 ______[答案] This is me (being) in the Niagara Falls.

朱饼馥1590she is always - --------- - (help)to others原因啊啊 -
毛胖固18877268348 ______ she is always___helping________ (help)to others be always doing=热爱做某事 如果我的回答对您有帮助,请点击下面的“选为满意答案”按钮,谢谢您!

朱饼馥15902lg5+lg4+in√e=多少呀 -
毛胖固18877268348 ______[答案] 2lg5+lg4+ln√e =2(lg5+lg2)+1/2 =2+1/2 =5/2

朱饼馥1590常微分方程y''+3y'+2y=1/(e^x+1)求解RT这个方程的特解怎么求? -
毛胖固18877268348 ______[答案] 2.令e^x=t,y=p(t),则y'(x)=tp'(t),y''=tp'+t^2p'',t^2p''+4tp'+2p=1/(t+1),即(t^2p)''=1/(t+1), 所以p=(t^(-1)+t^(-2))In(t+1)-t^(-1)+c1t^(-1)+c2t^(-2) 即通解为y=(e^(-x)+e^(-2x))In(e^(x)+1)-e^(-x)+c1e^(-x)+c2e^(-2x)

朱饼馥1590he had success in helping the girl find her mother的同义句he - __ - in helping the girl find her mother.i taught my grandma (to send e - mails on the internet)?对... -
毛胖固18877268348 ______[答案] succeeded teach,to do interesting to takes sent,to him

朱饼馥1590may thanks for+n/Ving造句,带翻译,急求啊,作业拜托啦啊 -
毛胖固18877268348 ______ 应为many thanks for+n/ving吧 e.g. Many thanks for your help/helping me.

朱饼馥1590《helping the victims in wemchuan earthquake》的英语作文 -
毛胖固18877268348 ______ the people in Wenchuan suffered a disastrous earthquake in 12 May,2008, large numbers of people lost their families in this disaster. we should help them to overcome this difficulty, not only to rebulit their homestead but also to restore their hopr for a better future. 希望对你有帮助 呵呵

朱饼馥1590y=3sin(3x+5)+e²求导 -
毛胖固18877268348 ______[答案] y=3sin(3x+5) +e^2 e^2为常数, 那么y 对x 求导得到 y'=3cos(3x+5) *(3x+5)' =9cos(3x+5)

朱饼馥1590Z+Z^( - 1)=2cosθ(Z不等于0,θ是z的辅角),求证z^n+z^( - n)=2cosnθ. -
毛胖固18877268348 ______[答案] 设Z=e^(ix) Z+Z^(-1)=e^(ix)+e^(-ix)=2cosx cosx=cosθ x=±(2mπ+θ) z^n+z^(-n)=e^[in(2mπ+θ)]+e^[-in(2mπ+θ)]=e^(inθ)+e^(-inθ)=2cosnθ.

朱饼馥1590求定积分1到e之间1/(1+x) dx -
毛胖固18877268348 ______[答案] =∫(1/(x+1)) dx = In|x+1|=In((e+1)/2)