一篇英语作文500字
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一篇英语作文500字
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Freedom主题:If I can not have freedom,I’d rather not be alive.Last century has seen a number of nations gaining independence from powers who have enjoyed years of rule over them.Some of the most str...
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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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