英语翻译
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Jingjing makes children smile--and that's why he brings the blessing of happiness wherever he goes.You can see his joy in the charming naivety of his dancing pose and the lovely wave of his black and ...
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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