do u want to learn chinese for free?
题目
do u want to learn chinese for free?
charge free.i can also teach on line .
答案
do u want to learn chinese for free?
你想免费学习中文吗?
charge free.i can also teach on line .
免费.我还可以网上（在线）教学.
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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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