已知2x-y=10,求:中括号(x²+y²)-(x-y)²+2y(x-y)中括号,÷4y的值

问题描述:

已知2x-y=10,求:中括号(x²+y²)-(x-y)²+2y(x-y)中括号,÷4y的值

〔x'2+y'2-x'2-y'2+2xy+2xy-2y'2]/2y=2x-y=10