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(m-2n)的平方+(n+2m)的平方
人气:486 ℃ 时间:2020-03-26 08:47:45
解答
=[(m-2n)+(n+2m)][(m-2n)-(n+2m)]
=(m-2n+n+2m)(m-2n-n-2m)
=(3m-n)(-m-3n)
=-(3m-n)(m+3n)
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