1. 1/2, 1, 1, ( ), 9/11, 11/13 A.2 B.3 C.1 D.7/92. 3/7, 5/8, 5/9, 8/11, 7/11, ( ) A.11/14 B.10/13 C.15/17 D.11/123. 4/3, 1, 13/4, 5, 46/5, 25, ( ), ( ) A.163/6, 50 B.163/6,125 C.109/6,50 D.109/6,105

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2. 3/7, 5/8, 5/9, 8/11, 7/11, (A )A.11/14 B.10/13 C.15/17 D.11/12奇數項3/7,5/9,7/11偶數項5/8,8/11,11/143. 4/3, 1, 13/4, 5, 46/5, 25, (163/6 ), ( 125)A.163/6, 50 B.163/6,125 C.109/6,50 D.109/6,105 奇數項4/3,13/4,46/5,163/6偶數項1,5,25,125