作文:The population problem
题目
作文:The population problem
答案
Almost every country in the world faced the population problem.China has the largest population,so the one-child policy was necessay.In America,there were 2 billion people 20 years ago,now there w...
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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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