y(3x-3y)²-(2y-2x)²(分解因式,

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y(3x-3y)²-(2y-2x)²(分解因式,

=9y(x-y)²-4(x-y)²
=(x-y)²(9y-4)

y(3x-3y)²-(2y-2x)²
=y*9(x-y)^2-4(x-y)^2
=(x-y)^2(9y-4)

9(x-y)^2-4(x-y)^2
=(9y-4)X(x-y)^2