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5/16×19/21-5/21×3/16(简算)
人气:429 ℃ 时间:2020-03-20 14:07:17
解答
5/16×19/21-5/21×3/16
=5/16 x 19/21- 3/21x5/16
=5/16x(19/21-3/21)
=5/16 x 16/21
=5/21
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