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计算或化简:(a-b+c)^2
人气:296 ℃ 时间:2020-02-03 00:00:47
解答
(a-b+c)^2
=[a-(b-c)]^2
=a^2-2a(b-c)+(b-c)^2
=a^2-2ab+2ac+b^2-2bc+c^2
=a^2+b^2+c^2-2ab-2bc+2ac
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