9m²-6m+2n-n²(因式分解,

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9m²-6m+2n-n²(因式分解,9m²-6m+2n-n²(因式分解,9m²-6m+2n-n²(因式分解,9m²-6m+2n-n

9m²-6m+2n-n²(因式分解,
9m²-6m+2n-n²(因式分解,

9m²-6m+2n-n²(因式分解,
9m²-6m+2n-n²
=9m²-n²-6m+2n
=(3m-n)(3m+n)-2(3m-n)
=(3m-n)(3m+n-2)