Time is flying away,and years are passing by．Only our friendship is always in my heart．Farewell,my f
题目
Time is flying away,and years are passing by．Only our friendship is always in my heart．Farewell,my friend!Take care,my friend!
答案
时光飞逝,岁月如梭.只有友谊长存心间.再见,我的朋友!保重,我的朋友!
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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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