问题
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2/3,1/2,3/7,7/18,() A、4/11;B、5/12;C、7/15;D、3/16
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:3/15,1/3,3/7,1/2,()。A.5/8 B.4/9 C.15/27 D.-3
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:1,2/3,5/9,1/2,7/15,4/9,()。A.5/9 B.3/5 C.2/13D.3/7
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3/15,1/3,3/7,1/2,()A.5/8 B.4/9 C.15/27 D.-3
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3/15,1/3,3/7,1/2,()。A.5/8 B.4/9 C.15/27 D.-3
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3/15,1/3,3/7,1/2,() A.5/8 B.4/9 C.15/27 D.-3