Some people have sad feelings just at times and others may have sad feelings pretty
题目
Some people have sad feelings just at times and others may have sad feelings pretty
答案
有些人偶尔会有悲伤的情绪,另外一些人则常常会感觉悲伤.
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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