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化简:(a-2b+3c)2-(a+2b-3c)2
人气:483 ℃ 时间:2019-12-17 14:32:20
解答
(a-2b+3c)2-(a+2b-3c)2
=[(a-2b+3c)+(a+2b-3c)][(a-2b+3c)-(a+2b-3c)],
=2a(-4b+6c),
=4a(3c-2b).
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