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(1)-8ab-3ab-9ba (2)1/3xy-1/2xy+7/6xy
列式
人气:260 ℃ 时间:2020-09-13 01:00:23
解答
(1)-8ab-3ab-9ba
=(-8-3-9)ab
=-20ab
(2)1/3xy-1/2xy+7/6xy
=(1/3-1/2+7/6)xy
=xy
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