1757= 31719=3(18-1)(18+1)=3*323=969

来源: jinjing 于 2017-03-11 10:43:10 [旧帖] [给我悄悄话] 本文已被阅读：次

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17*57= 3*17*19=3*(18-1)(18+1)=3*323=969