Yesterday,I went to a booking office
题目
Yesterday,I went to a booking office
Yesterday,I went to a booking office to buy ticket.I was about to leave while I saw a foreigner in trouble.He stood there,worrying.I went up and asked what was wrong with him.He said that he wants to buy a ticket to Hangzhou.The problem was that there were four bus station there,but he did not know which one he was to go to.However,I decidedto help him.
答案
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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