15.5與7.5的差初一1/2與1/3的和,商是多少?
(15.5-7.5)/(1/2+1/3)
=8/(5/6)
=8*6/5
=9.6
24個3/8加上24的3/8所得的和再除以3/7,商是多少?
[24*(3/8)+24*(3/8)]/(3/7)
=(9+9)/(3/7)
=18*(7/3)
=42
8減去4/5除以1/3的商,所得的差乘1.8,積是多少?
[8-4/5/(1/3)]*1.8
=[8-(4/5)*3]*1.8
=[40/8-12/5]*1.8
=(28/5)*1.8
=5.6*1.8
=10.08
從22.5乘0.8里減去0.625除5/8的商,結(jié)果是多少
22.5*0.8-[0.625/(5/8)]
=18-[0.625*(8/5)]
=18-1
=17