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答案: 6048-5973=75 75*12=900 5012-4987=25 25*36=900 方法:先分解質因數900=2*2*3*3*5*5 因為兩個四比特數位的末位數不能相同(因為每個數位都不能重複)且相减後乘於一個二位數,等於900,所以减出來的數要大於10小於90(若减出來為9,9*99=891
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