-x=2y-8

【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 12y(x-y)^2-8(x-y)^3=? （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 【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. (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian [(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 3x-2y=9 x-3y=2 x+y=5 x+2y=3 y=x 2x+y=8 先化简在求值（x+2y)(x-2y)(2x-y)(-2x-y)其中x=8,y=-8-2x-y)qz 【x+_2y】[x-2y]-[2x-y][-2x-y]x=8 y=-8 x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x 若x-y=1 化简（x+y)(x^2+y^2)(x^4+y^4)(x^8+y^8)(x^16+y^16)