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(m-2n+2)的平方
人气:389 ℃ 时间:2020-06-22 07:11:00
解答
(m-2n+2)^2
=[(m-2n)+2]^2
=(m-2n)^2+4(m-2n)+4
=m^2-4mn+4n^2+4m-8n+4
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