计算〔(x+y)2-y(2x+y)〕÷2x
问题描述:
计算〔(x+y)2-y(2x+y)〕÷2x
答
〔(x+y)2-y(2x+y)〕÷2x
=(x^2+y^2+2xy-2xy-y^2)÷2x
=x^2÷2x
=x/2