sally and her younger brother were fighting.their mother was tired of the fighting.and decided to
题目
sally and her younger brother were fighting.their mother was tired of the fighting.and decided to
punish them by making them stand on the same piece of newspaper in such a way that they could not touch each other.how did she do this?
答案
Sally's mother slid a newspaper under a door and made Sally stand on one side of the door and her brother on the other.
举一反三
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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