x^2-y^2/x^2-2xy+y^2其中x^2+y^2-2x-6y+10=0
问题描述:
x^2-y^2/x^2-2xy+y^2其中x^2+y^2-2x-6y+10=0
答
x^2+y^2-2x-6y+10=0 得(x-1)²+(y-3)²=0∴x=1,y=3.x^2-y^2/x^2-2xy+y^2=(x+y)(x-y)/(x-y)²=(x+y)/(x-y)=-2