1.x^2-9y^2/2x-6y 2.2x+6/x^+3x 3.x-2/x^2-4x+4 4.24xy^2z^3/4z^2y 5.-3xy·x/3y

【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y) (x+y)^2+6(x+y)+9 (x-2y)^2-6(2y-x)(x+y)+9(x+y)^2因式分解 81/8*(-x-y)^6*(x-y)^3*4/9(x+y)^4*(y-x)^2 计算(x-y)^7÷(y-x)^6+9-x-y)^3÷(x+y)^2 9(x+y)-2(x+y)-6(x+y)+18(x+y)合并同类项 合并同类项：9(x+y)-2(x+y)-6(x+y)+18(x+y) 计算：1.（x-1)^2+2(1-x) 2.(x-y)/(x+3y)÷(x^2-y^2)/(x^2+6xy+9y^2)-2y/(x+y）1.（x-1)^2+2(1-x)2.(x-y)/(x+3y)÷(x^2-y^2)/(x^2+6xy+9y^2)-2y/(x+y） x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 1.（x+y-z)+(x-y+z)-(x-y-z) 2.2x-(3x-2y+3)-(5y-2) 化简：x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y) x^3y^2+6x^2y+9x 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 (x+y)(x-y)-(x-y)^2如题 (x+y)(x-y)-(x-y)^2 2(x^2)(y^2)+9y-6x(y^2)-(x^2)y 分解因式 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