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hello everyone !my name is ^^,i am ^^years old .i study in ^^school .my mother is a teacher .she is very hard-working.my father is a doctor .he often works until night.i hope he can always stay with m...
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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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