how to make our city more beautiful
题目
how to make our city more beautiful
答案
how to make our city more beautifulTo make our city more beautiful,we can do many things.First,we should plant more trees and flowers to make our city look like a big garden.Second,we'd better produce...
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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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