Friendship作文
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Friendship作文
答案
Friendship As we all know, friendship plays a very important part in our daily life. In my opinion, people canhardly live without relationship. Because when you are down, he will cheer you up; whe...
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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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