It's true that we don't know what we've got until we lose it,but it's also true that we don't know w
题目
It's true that we don't know what we've got until we lose it,but it's also true that we don't know what we've been missing until it arrives、
答案
事实是,直到失去,我们才知道自己曾经拥有过什么,而且,直到它到来,我们才意识到自己正在失去它.
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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