求英语作文：I Love ZhengZhou
题目
求英语作文：I Love ZhengZhou
答案
Zhengzhou is a national famous historical and cultural city ratified by the State Council.It was an important metropolis during the Shang dynasty as early as 3500 years ago and became a capital du...
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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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