已知x^2+2x+1+y^2减8y+16=0,求x分之y的值.

已知x^2+2x+1+y^2减8y+16=0,求x分之y的值. 已知x^2-8x+y^2-y+16又1/4=0,求[(x+y)(x-y)-(x+y)^2-2y(x-3y)]÷4y的值 已知x+y=a,2x-y=-2a,求[（x/y-y/x)/(x+y)-x(1/x-1/y)]/[(x+1)/y]的值 已知x^2+y^2-8x+12y+52=0 ,求1/2x-1/x-y(x-y/2x-x^2+y^2) 已知x^2+y^2-8x+12y+52=0 ,求1/2x-1/x-y(x-y/2x-x^2+y^2) 已知x^2+y^2-16x-8y+25=0,求y/x-x/y的值 已知X*X+Y*Y+6X-8Y+25=0 求（Y/X)+(X/Y)-2=? 【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y) 已知x+y/y=11/8,求x-y/x+2y的值. 已知x²+2x+1+y²-8y+16=0,求y/x的值 16-8（x-y)+(x-y)2 已知x-y=1,求[(x+2y)^2+(2x+y)(x-4y)-3(x+y)(x-y)]除以y的值大神们帮帮忙 已知:【(x²+y²)-(x-y)²+2y(x-y)】/4y=1,求4x/4x²-y²-1/2x+y 已知x-y=1,求[(x+2y)²+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值 已知：2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x) 已知：X,Y为实数,且Y小于√X-1+√1-X+3,化简|Y-3|-√Y的2次方-8Y+16 已知x+y/x=11/8,求x-y/x+2y的值 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)