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620/40豎式計算并驗算

620/40豎式計算并驗算 620÷40=15.5 驗算: 15.5×40=620 或:

620 × 40 豎式計算 620 × 40 = 24800

620÷40 =(620÷10)÷(40÷10) =62÷4 =15.5

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