问题
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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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:1,3,3,5,7,9,13,15,(),()。A.19,21 B.19,23 C.21,23 D.27,30
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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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1,3,3,5,7,9,13,15,(),()。 A.19,21 B.19,23 C.2l,23 D.27,30
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1,3/4,9/5,7/16,25/9,() A.15/38 B.11/36 C.14/27 D.18/29
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1,3/4,9/5,7/16,25/9,()A.15/38B.11/36C.14/27D.18/29