what counts is how much work me must do to pay for what we buy
题目
what counts is how much work me must do to pay for what we buy
答案
真正重要的是你为了你所想要买的所必须去做的
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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