81/8*(-x-y)^6*(x-y)^3*4/9(x+y)^4*(y-x)^2
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81/8*(-x-y)^6*(x-y)^3*4/9(x+y)^4*(y-x)^2
81/8*(-x-y)^6*(x-y)^3*4/9(x+y)^4*(y-x)^2
81/8*(-x-y)^6*(x-y)^3*4/9(x+y)^4*(y-x)^2
81/8*(-x-y)^6*(x-y)^3*4/9(x+y)^4*(y-x)^2
=81/8*4/9*(-1)^6*(x+y)^6(x+y)^4(x-y)^3(x-y)^2
=9/2*(x+y)^5*(x+y)^5(x-y)^5
=9/2*(x+y)^5[(x+y)*(x-y)]^5
=9/2*(x+y)^5(x^2-y^2)^5
=9/2*(x^3-xy^2+x^2y-y^3)^5
【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y)
81/8*(-x-y)^6*(x-y)^3*4/9(x+y)^4*(y-x)^2
[2(x-y)^5-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2[2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
(x-8y)(x+y)
(3x-4y)(5x-4y)-(7x-8y)(6y-5x)
4x-3y/x-2y÷6y-8x/y-2x
3(x-y)^2-7(x-y)+8(y-x)^2+6(y-x)合并同类项.
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