伊索寓言狐狸和葡萄
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伊索寓言狐狸和葡萄
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One hot summer day a fox was walking through an orch`ard.He stopped before a bunch of grapes.They were ripe and juicy. "I’m just feeling thirsty," he thought.So he backed up a few paces,got a ...
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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