國二數2008-8
Dec 5th 2013, 03:26
2013-12-05 14:19:26 補充
(a,b)即以下12種: (1,585) , 不合 (因為a > b才可) (13,45) , 不合 (5,117) , 不合 (65,9) , 故(x,y)=(37,28) (3,195) , 不合 (39,15) , 故(x,y)=(27,12) (15,39) , 不合 (195,3) , 故(x,y)=(99,96) (9,65) , 不合 (117,5) , 故(x,y)=(61,56) (45,13) , 故(x,y)=(29,16) (585,1) , 故(x,y)=(293,292) 故滿足條件的解有6組
2013-12-05 14:19:33 補充
Ans: 6組 註 : 這6組是(x,y) = (37,28), (27,12), (99,96), (61,56), (29,16), (293,292)
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