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56.6×0.6-28.3×1.2怎么简算
人气:349 ℃ 时间:2020-02-01 04:06:40
解答
56.6×0.6-28.3×1.2
=56.6×0.6-28·3×2×0·6
=56.6×0.6-56·6×0·6
=0
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