7.8乘五分之一加2.2加20% 125乘83-25乘15 三十八又四分之三减15.38加61.25减4.62

7.8乘五分之一加2.2加20%
=7.8x0.2+2.2x0.2
=(7.8+2.2)x0.2
=2
125乘83-25乘15
=125x83-25x5x3
=125x(83-3)
=125x80
=10000
三十八又四分之三减15.38加61.25减4.62
=(38.75+61.25)-(15.38+4.62)
=100-20
=80
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