（4x-3y)(5x+2y)-2x(9x-5y) 等于多少

4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+（x-3y)(x-5y)+(x-2y)(x-4y) （4x-3y)(5x+2y)-2x(9x-5y) 等于多少 1.(x^3-x^2-4x+1)/(x^2-3x+2)-(x^3-2x^2-9x+21)/（x^2-5x+6）+（x^2-3x+8）/（x^2-4x+3）2.{(x^2)/（x-y)}*{y/(x+y)}-{(x^4y)/(x^4-y^4)}÷{（x^2/x^2+y^2）^2} 5/4(x+y)(-x-y)^3*[-4/3(x-y)]*[-3/5(y-x)^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 (2x-y)(3x-4y)-2(x-y)(2x-5y)简便运算 5x^3y(x-y)^3-10x^4y^3(y-x)^2因式分解 5x^3y(x-y)^3-10x^4y^3(y-x)^2 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 5X^3Y(X-Y)-10X^4Y^3(Y-X)^2因式分解 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 （x-y）^3×（y-x）^4+（x-y）^2×（y-x）^5 化简 x-[y-2x-(x-y) -9-4[2x-5(x+1)] 2x-3{y-[3x-(2y-x)]-2x}过程一步一步的列好x-[y-2x-(x-y) -9-4[2x-5(x+1)] 2x-3{y-[3x-(2y-x)]-2x} 计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2) 先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5 化简:5(x-y)+2(x+y)-3(x-y)