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