8又2/5(五分之二)×(20-5又5/6[六分之五])
= (42/5) × (15-5/6)
= (42/5) × 15 - (42/5) × (5/6)
= 126 - 7
= 119
8又2/5(五分之二)×(20-5又5/6[六分之五]) = = = 简便计算
8又2/5(五分之二)×(20-5又5/6[六分之五]) = = = 简便计算
数学人气:553 ℃时间:2020-02-20 14:54:41
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