问题
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2/5, 3/7, 4/10, 6/14, 8/20, 12/28,______ () A.224/56 B.14/32 C.20/48 D.16/40
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3,3,4,5,7,7,11,9,______,______ () A.13,11 B.16,12 C.18,11 D.17,13
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1,3/4,9/5,7/16,25/9,______ () A.15/38 B.11/36 C.14/27 D.18/29
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3,8,6,11,9,14,______,______ A.11,16 B.12,16 C.12,17 D.13,17
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2,4,7,21,______,96 A.24 B.27 C.54 D.81
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15,7,12,6,9,5,__________。 A.6.4 B.14.11C.6.5D.14.10