怎样化简 [(3a+2b)(3a-2b)-(a+2b)(5a-2b)]/4a
人气：466 ℃ 时间：2019-09-17 05:00:23
解答
原式=(9a2-4b2-5a2+2ab-10ab+4b2)/4a
=(4a2-8ab)/4a
=a-2b
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