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(2m-n)² -(3m+2n)² 因式分解
人气:288 ℃ 时间:2020-03-10 18:41:14
解答
(2m-n)² -(3m+2n)²
=(2m-n+3m+2n)(2m-n-3m-2n)
=(5m+n)(-m-3n)
=-(5m+n)(m+3n)
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