What did you do during the summer vacation 的文章 10句话
题目
What did you do during the summer vacation 的文章 10句话
答案
I had a busy and interesting summer vacation.I did my homework every day so I finished doing my homework ten days before the new term.I also played table tennis and basketball with my friends every da...
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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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