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hobby
10.08日教啊
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I like sports very much.But basketball is my favorite sport.I often play basketball with my friends on the schoole piayground on my free time.Play basketball help to build me up,so I am very healthy n...
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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