5.4-1.5×2.6 3/5÷[(3/4-2/3 - 知识问答

5.4-1.5×2.6 3/5÷[(3/4-2/3)×4] 30.8÷[14-(9.85+1.07简便计算

1个回答

5.4-1.5×2.6=5.4-1.5x(2+0.6)=5.4-3-0.9=1.5
3/5÷[(3/4-2/3)×4]=3/5x1/4x(3/4-2/3)=3/20x3/4-3/20x2/3=9/80-6/60=9/80-1/10=1/80
30.8÷[14-(9.85+1.07]
=30.8÷[14-(10-0.15+1+0.07)]
=30.8÷[14-(11-0.08)]
=30.8÷(14-11+0.08)
=30.8÷(14-11+0.08)
=30.8÷2.92
=10.548

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