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五年級數學小數加減法簡便計算a+b=b+aa+b+c=a+(b+c)a-b-c=a-(b+c)5.93+0.19+2.81 3.07-0.38-1.62 7.3+2.7-7.3+2.7 1.27+3.9+0.73+16.148.4+2.78+51.6-0.78 23.4-0.8-13.4-7.2 139.46—(58.74+1…
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