61.2乘4.2减22.8的简便方法

lskllh2022-10-04 11:39:541条回答

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下雪11 共回答了17个问题 | 采纳率94.1%
61.2×4.2-22.8
=61.2×9/2-22.8
=30.6×9-22.8
=275.4-22.8
=252.6
1年前

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