Why do people wish for somgthing they have not got
题目
Why do people wish for somgthing they have not got
答案
Because when people don't get it,they don't know what is it exactly,They always think it will be wonderful/great.So it is a kind of good things that people are seeking for.
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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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