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12.7+12.5 5简便计算

12.7+12.5÷5=12.7+2.5=15.2谢谢,请采纳

先算12.5÷5=2.5 12.7+2.5=15.2

12.7+12.5÷5=12.7+2.5=15.2朋友,请采纳正确答案,你们只提问,不采纳正确答案,回答都没有劲!!!朋友,请【采纳答案】,您的采纳是我答题的动力,如果没有明白,请追问.谢谢.

12+12.5÷5=12+(12+0.5)÷5=12+12÷5+0.5÷5=12*(1+1/5)+1/10=12*6/5+1/10=72/5+1/10=144/10+1/10=145/10=14.5

用脱式计算或者是简便计算.12.7+ 12.5x5=12.7+62.5=75.2

先同时乘以10得到125/60=25/12=2……1

(1)12.7+12.5+0.5=12.7+(12.5+0.5)=12.7+13=25.7 (2)2.5*4.6*0.4=2.5*0.4*4.6=1*4.6=4.6 (3)5.4*99+5.4=5.4*(99+1)=5.4*100=540 (4)(0.5+0.25)*4=0.5*4+0.25*4=2+1=3 (5)39÷0.125÷8=39÷(0.125*8)=39÷1=39 (6)46.5*99+46.5=46.5*(99+1)=46.5*100=4650 (7)4.85*1.25*8=4.85*(1.25*8)=4.85*10=48.5 (8)(455-12.5*4)÷8.1=(455-50)÷8.1=405÷8.1=50

12/7*36+12/5*36 =(12/7+12/5)*36=1*36=36

17.5+12.5x5 解:原式: =5x3.5+12.5x5 =5x(3.5+12.5) =5x16 =80

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