Each of the Smith brothers has as mang sisters as he has brothers.But each of the Smith sistershas t
题目
Each of the Smith brothers has as mang sisters as he has brothers.But each of the Smith sistershas twice as many brothers as she has sisters.How many sisters ang brothers are there in Smith family?
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An animal which produes wool()
An animal which flies()
答案
Each of the Smith brothers has as many sisters as he has brothers.But each of the Smith sisters has twice as many brothers as she has sisters.How many sisters and brothers are there in Smith family?4 ...
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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