龟兔赛跑英语怎么说
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龟兔赛跑英语怎么说
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The Tortoise and the Hare One of Aesop's Fables Illustrated by Arthur Rackham Once upon a time there was a hare who, boasting how he could run faster than anyone else, was forever teasing tortoise for...
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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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