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