如何保持好心情的英语文章
题目
如何保持好心情的英语文章
答案
As is known to us all,it is of great important for us to keep a good mood in our study and our work as well.Therefore,how to keep a good mood has been heatly discussed around us recentlIt is universal...
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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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