9.8×25怎么简算 - 爱问知识人
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乘法分配律吧
1/2/(4/5)/(2/9*3/8)=5/8/(1/12)=5*12/8=5*3/2=15/2=7.5
3/5-(5/8-1/6)
3/5-(5/8-1/6)
=3/5-11/24
=72/120-55/120
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