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五年級簡便計算訓練(a+b)+c = a+(b+c)1.2.73+0.89+1.27 2.4.37+0.28+1.63+5.72a-b-c = a-(b+c)1.10-0.432-2.568 2.9.3-5.26-2.743.13.4-(3.4+5.2)4.1…
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