the second reason is that trains have never been as common in the United States as they are in othe
题目
the second reason is that trains have never been as common in the United States as they are in othe
答案
第二个原因是在美国的火车从不和其他地方的火车一样平常
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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