(x-3y)(a+b)+(3x-2y)(a+b)
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(x-3y)(a+b)+(3x-2y)(a+b)(x-3y)(a+b)+(3x-2y)(a+b)(x-3y)(a+b)+(3x-2y)(a+b)原式=(a+b)×(x-3y+3x-2y)=(a+b)×
(x-3y)(a+b)+(3x-2y)(a+b)
(x-3y)(a+b)+(3x-2y)(a+b)
(x-3y)(a+b)+(3x-2y)(a+b)
原式
=(a+b)×(x-3y+3x-2y)
=(a+b)×(4x-5y)
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