问题
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11,17,(),31,41,47 A. 19;B. 23;C. 27;D. 29;
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1,1/2 , 6/11 ,17/29 , 23/38 ,()A.28/45 B.117/191 C.31/47 D.122/199
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31 29 23 () 17 13 11 A.21 B. 20 C. 19 D. 18
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1 1/2 6/11 17/29 23/38 ()A. 117/191 B. 122/199 C. 28/45 D. 31/47
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5,11,17,23,29,()A.35B.38C.42D.60
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5 11 17 23 29 ()。A.35 B.38 C.42 D.60