问题
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20/9,4/3,7/9,4/9,1/4,() A、3/7;B、5/12;C、5/36;D、7
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7, 9, 1, 15, -5, 21, ()。 A.36 B.-11 C.13 D.27
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3,3,5,10,7,21,9,36() A.10,50 B.11,45 C.11,55 D.11,40
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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
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7,9,1,15,-5,21,()A. 36 B.-11 C.13 D.27
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