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4.25÷2.5×9.9+0.17的简便计算法
人气:315 ℃ 时间:2020-04-10 04:16:29
解答
4.25÷2.5×9.9+0.17
=1.7×9.9+0.17
=1.7×9.9+0.1×1.7
=1.7×(9.9+0.1)
=1.7×10
=17
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