问题
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1,2,3,6,11,20,() A、25;B、36;C、42;D、37
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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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:1/2,3/2,5/6,11/30,()。A.29/64 B.40/57 C.41/330 D.108/119
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1/2,3/2,5/6,11/30,()。A.29/64 B.40/57 C.41/330 D.108/119
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2/3 ,1/2 ,5/9 ,(),11/15 A.2/5 B.6/11 C.3/4 D.7/12
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11/26/1117/2923/38() A.117/191B.122/199 C.28/45D.31/47
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