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

來源: jinjing 於 2017-03-11 10:43:10 [舊帖] [給我悄悄話] 本文已被閱讀：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.

Change Ad Consent

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