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数学
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化简(5a+7b-8c)^2-(5a+7b+8c)^2
人气:475 ℃ 时间:2020-06-07 21:02:07
解答
(5a+7b-8c)^2-(5a+7b+8c)^2
=(5a+7b-8c-5a-7b-8c)(5a+7b-8c+5a+7b+8c)
=-16c * (10a + 14b)
=-160ac-224bc
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