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98.6×[3/4÷(5/6-7/12)] 简便算法
人气:248 ℃ 时间:2020-04-10 11:28:17
解答
98.6×[3/4÷(5/6-7/12)]
=98.6×[3/4÷3/12]
=98.6×(3/4×4)
=(100-1.4)×3
=100×3-1.4×3
=300-4.2
=295.8
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