10(X+2Y)^2-7(X+2Y)^3+8(2Y+X)^2-2(2Y+X)^3

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10(X+2Y)^2-7(X+2Y)^3+8(2Y+X)^2-2(2Y+X)^310(X+2Y)^2-7(X+2Y)^3+8(2Y+X)^2-2(2Y+X)^310(X+2Y)^2-7(X+2Y)^3

10(X+2Y)^2-7(X+2Y)^3+8(2Y+X)^2-2(2Y+X)^3
10(X+2Y)^2-7(X+2Y)^3+8(2Y+X)^2-2(2Y+X)^3

10(X+2Y)^2-7(X+2Y)^3+8(2Y+X)^2-2(2Y+X)^3
提取（x+2y)^2,得(x+2y)^2[10-7(x+2y)+8-2(x+2y)]
化简得(x+2y)^2(-9x-18y+18)
=-9(x+2y)^2(x+2y-2)
=-9(x+2y)^3+(-2)*[-9(x+2y)^2]
再用完全平方和和完全立方和公式即可

化简3(x-y)-7(x--y)+2(y-x) x(x-y)2-(y-x)3 [2/3x-2/x+y(x+y/3x-x-y)]/x-y/x 化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x 计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x 化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x [2X+(Y-10)][2X-(Y-10)]-(3X+Y)(3X-Y) (-3x+7y)(-7y-3x)-(x-3y)(2x+3y) 3(x-y)^2-7(x-y)+8(y-x)^2+6(y-x)合并同类项. 18(x+y)^8(x-y)^7÷[3(x+y)^3(x-y)^3]^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 (x+5y)^+(2x+10y)(3x-y)+(3x-y)^ (x+5y)²-(2x+10y)(3x-y)+(3x-y)² 5X^3Y(X-Y)-10X^4Y^3(Y-X)^2因式分解若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于计算：(x-y)^7÷(y-x)^6+(-x-y)^3÷(x+y)^2 2(y-x)的平方-7(x-y)+6(x-y)-3(y-x)的平方