改错题,求解释
题目
改错题,求解释
Here is my idea about how a friend is like. Firstly, a friend is someone you can share your secrets. If you tell him a secret, never will he talks about it with anybody else. Besides, a friend is always good listener when you need one. After hear your sad stories, he will say some words that is nice and warm. Still, your happiness makes him happily too. What’s more, a good friend is willing to offer the help to which you need, or can at least give you some advices. In a word, friends are those you like and trust, and you will enjoy every minute that you spent with them.
答案
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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