已知（|x|-1）²+根号下y+1/x-y=0,试求x-8y的算术平方根

已知（|x|-1）²+根号下y+1/x-y=0,试求x-8y的算术平方根
已知（|x|-1）²+根号下y+1/x-y=0,试求x-8y的算术平方根

已知（|x|-1）²+根号下y+1/x-y=0,试求x-8y的算术平方根
|x|-1=0
(y+1)/(x-y)=0
∴x=1
y=-1
∴ √(x-8y)=√9=3