4(x-2y)2-9(3x-4y)24(x-2y)²-9(3x-4y)²

81/8*(-x-y)^6*(x-y)^3*4/9(x+y)^4*(y-x)^2 3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9 4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 (66x^6y^3-24x^4y^2+9x^2y)÷(-3x^2y)化简 (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= (x+3y-4)(2x-y) 计算（2x-3y)(x+4y)-(3x+y)(x-2y)（2x-3y)(x+4y)-(3x+y)(x-2y) 因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+（x-3y)(x-5y)+(x-2y)(x-4y) x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² (2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y) 9y=3x-(x-1),4(x+y)-(2x+4)=8y （4x-3y)(5x+2y)-2x(9x-5y) 等于多少 根据3（x+y)-2(x-y)=11,4(x+y)+3(x-y)=9可得出x+y= ,x-y= [(x+y)(x-y)-(x-y)²+2y(x-y)]÷4y (2x-y)(2x+y)-2(3x-4y)(4y+3x) x^4+x^3y+x^2*y^2+y^3x+y^4分解因式 (3x-y)(y+3x)-2(4x-3y)(4x+3y) (x-3y)(y+2x)-(4y-3x)(3x+4y)计算