(3x+2y)(4x-5y)-11(x+y)(x-y)+5xy,其中x＝三分之一,y＝-二分之一.先化简再求值.

4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+（x-3y)(x-5y)+(x-2y)(x-4y) 3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9 5/4(x+y)(-x-y)^3*[-4/3(x-y)]*[-3/5(y-x)^2] 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 (2x-y)(3x-4y)-2(x-y)(2x-5y)简便运算 5X^3Y(X-Y)-10X^4Y^3(Y-X)^2因式分解 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 （x-y）^3×（y-x）^4+（x-y）^2×（y-x）^5 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 3(x-y)-2(x+y)-5(x-y)+4(x+y)+3(x-y) 化简合并同类项 解方程组 {3(x+y)-4(x-y)=11 {2(x-y)+5(x+y)=27 解方程组 {3(x+y)-4(x-y)=11 {2(x-y)+5(x+y)=27全过程、快 接二元一次4(x+y)-3(x-y)=9;5(x-y)+2(x+y)=11 大括号x+y/2+x-y/3=11/6 4(x+y)-5(x-y)=7 快