9(x-2y)的3次方-(x-2y)用公式法怎么做

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9(x-2y)的3次方-(x-2y)用公式法怎么做9(x-2y)的3次方-(x-2y)用公式法怎么做9(x-2y)的3次方-(x-2y)用公式法怎么做9(x-2y)^3-(x-2y)=(x-2y)[9

9(x-2y)的3次方-(x-2y)用公式法怎么做
9(x-2y)的3次方-(x-2y)用公式法怎么做

9(x-2y)的3次方-(x-2y)用公式法怎么做
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) [9(x-2y) ^2 - 1]
=(x-2y) [3(x-2y) - 1] [3(x-2y) +1]