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24.7×16.5+24.7×78.6+24.7×4.9 简便方法
人气:165 ℃ 时间:2020-04-13 23:17:04
解答
24.7×16.5+24.7×78.6+24.7×4.9
=24.7×(16.5+78.6+4.9)
=24.7×100
=2470
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