x(y-x)²(a-b)+(x-y)三次方(b-a)

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x(y-x)²(a-b)+(x-y)三次方(b-a)

x(y-x)²(a-b)+(x-y)三次方(b-a)
x(y-x)²(a-b)+(x-y)三次方(b-a)

x(y-x)²(a-b)+(x-y)三次方(b-a)
x(y-x)²(a-b)+(x-y)三次方(b-a)
=x(x-y)²(a-b)-(x-y)三次方(a-b)
=(x-y)²(a-b)[x-(x-y)]
=y(x-y)²(a-b)

(x-y)^2 (a-b) (x-x+y)
=....................*y