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由題意可知:0不宜做乘數,更不能做除數;乘數如果是1,無論被乘數是幾,都將在算式中出現兩次,所以乘數不是1;同理乘數也不是5;被除數是三個一位數的乘積,其中一個是5,另兩個沒有1,也不能有2(否則2×5=10,從…
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