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82.4×6.7+8.24×31+0.824×20的简便算法
人气:100 ℃ 时间:2020-03-18 22:05:20
解答
82.4×6.7+8.24×31+0.824×20
=82.4×6.7+82.4×3.1+82.4×0.2
=82.4×(6.7+3.1+0.2)
=82.4×10
=824
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