(x+y)^2-8(x+y)+48=

x-y/x-x+y/y-(x+y)(x-y)/y² y/x=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) 【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= (x+y)^2-8(x+y)+48= (x+y)^2-8(x+y)+48= 12y(x-y)^2-8(x-y)^3=? x+y=8,x^2 - y^2=48 ,则y-x=() （x+2y)(x-2y)-(2y-x)(-2x-y)其中x=8,y=-8 [(x+2y)(x-2y)-(x-2y)^2+8y(x+y)]除以4x= 已知X*X+Y*Y+6X-8Y+25=0 求（Y/X)+(X/Y)-2=? x*x+2x-y*y+6y-8=0,x+y不等于2,求x-y的值 已知x+y/y=11/8,求x-y/x+2y的值. (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian 填空：x-y/x+y=( )/x^2-y^2 （x-y)2•(y-x)³(x-y)=? [(2x-y)^2-y(y-4x)-8x]其中x=-1/2 9y=3x-(x-1),4(x+y)-(2x+4)=8y 已知x+y/x=11/8,求x-y/x+2y的值