there is a book and aruler on the desk改成一般疑问句,做否定和肯定回答
题目
there is a book and aruler on the desk改成一般疑问句,做否定和肯定回答
答案
is there a book and aruler on the desk?
yes,there is.no,there isn't.
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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