一篇帮妈妈做家务的英语作文
题目
一篇帮妈妈做家务的英语作文
答案
Today is Sunday.I got up very early,because I wanted to help my mother with the housework.She worked vey hard on weekdys,but she still have to do many houseworks after work.So I decided to help her.Wh...
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已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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