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104×25-1680/16这道算式怎么简便?
人气:135 ℃ 时间:2020-06-13 19:33:11
解答
104×25-1680/16
=(100十4)x25x4一1680/16X4
=100x100十4x10O一420
=10400一42O
=998O
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