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数学
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因式分解(5a-4b)^2-(4a+5b)^2
人气:160 ℃ 时间:2020-02-06 11:48:43
解答
(5a-4b)^2-(4a+5b)^2
=(5a-4b+4a+5b)(5a-4b-4a-5b)
=(9a-b)(a-9b)
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