2(x-y)^2-6(x-y)+8(y-x)^2+5(y-x)其中x-y=5求化简求值,先同类项

【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)^5-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2[2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2 【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 4x-3y/x-2y÷6y-8x/y-2x 3(x-y)^2-7(x-y)+8(y-x)^2+6(y-x)合并同类项. 81/8*(-x-y)^6*(x-y)^3*4/9(x+y)^4*(y-x)^2 x*x+2x-y*y+6y-8=0,x+y不等于2,求x-y的值 已知X*X+Y*Y+6X-8Y+25=0 求（Y/X)+(X/Y)-2=? 化简y(x+y)+(x+y)(x-y)-x^2 计算:(x-y)^2*(y-x)^2*(x-y)^6 6(x+y)2-2(x-y)(x+y)因式分解 1.（（y+2x)(-2x+y)+4(x+2y)^2)/3y 2.（2(x-y)^3-8(x-y）^2(x+y)+6y(x-y)^2）/2（x-y)^2 (x+y)(x-y)-(x-y)^2如题 (x+y)(x-y)-(x-y)^2 (x-y)²-8(x-y-2) 16-8（x-y)+(x-y)2 -8(y-x)^2×(x-y) (x+y)^2+6(x+y)+9