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一個數的平方,個位只能是1,4,5,6,9;三個數的平方數的和的個位為0,只能是1,4,5;對應原來的數的個位(1,9)(2,8)(5),對應質數(11,19,29,31,41,59,61,71,79,89…)(2)(5);所以其中兩個…
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