Have you seen a ( )pen I left it here this morning.Is it( )black one?I think I saw it somewhere.
题目
Have you seen a ( )pen I left it here this morning.Is it( )black one?I think I saw it somewhere.
Is it ( ) black one I think I saw it somewhere.
这两个空都填什么?请说明原因.
答案
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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