已知:2x²+2xy+y²-2x+1=0 求:(x-y)^5

问题描述:

已知:2x²+2xy+y²-2x+1=0 求:(x-y)^5

∵2x²+2xy+y²-2x+1=0
∴x²+2xy+y² +x²-2x+1=0
(x+y)²+(x-1)²=0
x+y=0 x-1=0
解得
x=1 y=-1
∴x-y=1-(-1)=2

(x-y)^5=2^5=32