(3m-1)²-4n²怎么算

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(3m-1)²-4n²怎么算
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(3m-1)²-4n²怎么算
(3m-1)²-4n²怎么算

(3m-1)²-4n²怎么算
(3m-1)²-4n²
=(3m-1+2n)(3m-1-2n)