jack and his friends are from the u s a对the u s a提问
题目
jack and his friends are from the u s a对the u s a提问
答案
Where are Jack and his friends from?
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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