问题
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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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:2/3,1/2,2/5,1/3,2/7,()。 A.1/4 B.1/6 C.2/11 D.2/9
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2/3,1/2,2/5,1/3,2/7,()。A.1/4 B.1/6 C.2/11 D.2/9
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.2/3,1/2,2/5,1/3,2/7,() A.1/4 B.1/6 C.2/11 D.2/9
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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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2/3,1/2,2/5,1/3,2/7,() A.1/4 B.1/6 C.2/11 D.2/9