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(2.5×8.8+2.5×0.8)×1.25 巧算
人气:297 ℃ 时间:2020-03-28 13:55:16
解答
(2.5×8.8+2.5×0.8)×1.25
=2.5×(1.1+0.1)×0.8×1.25
=2.5×12×1
=2.5×2×6
=5×6
=30
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