9⼀10-括号里1⼀6+2⼀5括起来等于多少呢?

2025-05-15 20:15:03
推荐回答(1个)
回答1:

9/10-(1/6+2/5)
=9/10-{(1*5)/6*5)+(2*6)/(5*6)}
=9/10-(5/30+12/30)
=9/10-17/30
=(9*3)/(10*3)-17/30
=27/30-17/30
=(27-17)/30
=10/30
=1/3
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