求作文 My Summer Vacation
题目
求作文 My Summer Vacation
答案
The summer vacation had come round again.Instead of just playing all day long,I helped my parents to do some easy chores and visited some places of interest.These things really open up my eyes and imp...
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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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