问题
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1/4, 2/5, 5/7, 1, 17/14, () A. 25/17 B. 26/17 C. 25/19 D. 26/19
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4,6,5,7,7,9,11,13,19,21,() A. 27,29 B. 32,33 C. 35,37 D.41,43
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13,19,11,22,(),25,7,()。A.15 26 B.25 24 C.16 18 D.9 28
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4,6,5,7,7,9,11,13,19,21,(),() A.27,29 B.32,33 C.35,37 D.41,43
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2,7, 9,19,26, ()。A.28 B.37 C.41 D.53
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2 5 9 19 37 ( )。A. 59 B. 64 C. 72 D. 75