I was on the escalator in a market.there was an old man who was about five or six people 的全文
题目
I was on the escalator in a market.there was an old man who was about five or six people 的全文
答案
I was on the escalator in a market. Therewas an old man who was about five or six people in the front of me. Peoplebehind him were all in a hurry and saw him as a rock. The old man knew theseclearly a...
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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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