(2x-3y)(3x-2y)=

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(2x-3y)(3x-2y)=
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(2x-3y)(3x-2y)=
(2x-3y)(3x-2y)=

(2x-3y)(3x-2y)=
原式=2x(3x-2y)-3y(3x-2y)
=6x²-4xy-9xy+6y²
=6x²-13xy+6y²

(2x-3y)(3x-2y)
=6x²-13xy+6y²
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原式=（2x-3y)^3 + [(3x-2y)-5(x-y)][(3x-2y)^2+5(3x-2y)(x-y)+25(x-y)^2]
=（2x-3y)^3 + （3y-2x)[(3x-2y)^2+5(3x-2y)(x-y)+25(x-y)^2]
=(2y-3x)【(2y-3x)^2 - (2y-3x)[(3x-2y)^2+5(3x-2y)(x-y)+25(x-y)^2] 】

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