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1、因為0只能做個位,所以只要在2,5,7中選擇兩個數把其中一個因數確定,另一個因數自然就確定了.所以有A3,2=6個2、這六個全部寫出來25×70=175027×50=135057×20=114052×70=364072×50=360075×20=1500所以最大的是5…
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