When you are in the most pain when,you should use what kind of expression on the face of others
题目
When you are in the most pain when,you should use what kind of expression on the face of others
is a smile .Still laughing...When you fall down,how to fall with dignity
答案
当你最痛苦的时候,在别人面前你该是什么表情,是微笑,是笑,你摔倒了,但尊严不能丢.
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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