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(a+b-2c)(a-b+2c)
人气:256 ℃ 时间:2020-05-12 09:17:40
解答
(a+b-2c)(a-b+2c)
=[a+(b-2c)][(a-(b-2c)]
=a2-(b-2c)2
=a2-(b2-4bc+4c2
=a2-b2+4bc-4c2
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