已知|(4x-3y-11)/3|+(2x+5y+1)²=0,求x²-2xy+2y²的值

题目

已知|(4x-3y-11)/3|+(2x+5y+1)²=0,求x²-2xy+2y²的值

答案

4x-3y-11=0 (1)
2x+5y+1=0 (2)
(1)x5+(2)x3:
26x-55+3=0
x=2,y=-1
x²-2xy+2y²
=4+2+2
=8