因式分解(3m+2n)2-4(m-n)2

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(3m+2n)²-4(m-n)²

=(3m+2n)²-2²蔽则裂宏闭(m-n)²
=(3m+2n)²盯世-(2m-2n)²
=(3m+2n+2m-2n)(3m+2n-2m+2n)
=5m(m+4n)

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