9（x-2y）^3-(x-2y)
=（x-2y）(9(x-2y)^2-1)
=（x-2y）(3(x-2y)+1)(3(x-2y)-1)
=（x-2y）(3x-6y+1)(3x-6y-1)
9（x-2y）3-(x-2y)
=(x-2y)[(x-2y)²-1]
=(x-2y)(x-2y+1)(x-2y-1)
9(x-2y)³-(x-2y)
=(x-2y)[9(x-2y)²-1]
=(x-2y)(3x-6y-1)(3x-6y+1)
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