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(a-2b+3c)(a+2b-3c)=______.
人气:270 ℃ 时间:2020-05-06 04:48:02
解答
(a-2b+3c)(a+2b-3c),
=[a-(2b-3c)][a+(2b-3c)],
=a2-(2b-3c)2
=a2-(4b2-12bc+9c2),
=a2-4b2+12bc-9c2
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