数学推理-> 2/3,1/2,3/7,7/18,( )2/3,1/2,3/7,7/18,( )A.5/9 B.4/11C.3/13 D.2/55,5,14,38,87,( )A.167 B.168C.169 D.170

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数学推理->2/3,1/2,3/7,7/18,()2/3,1/2,3/7,7/18,()A.5/9B.4/11C.3/13D.2/55,5,14,38,87,()A.167B.168C.169D.17

数学推理-> 2/3,1/2,3/7,7/18,( )2/3,1/2,3/7,7/18,( )A.5/9 B.4/11C.3/13 D.2/55,5,14,38,87,( )A.167 B.168C.169 D.170
数学推理-> 2/3,1/2,3/7,7/18,( )
2/3,1/2,3/7,7/18,( )A.5/9 B.4/11C.3/13 D.2/55,5,14,38,87,( )A.167 B.168C.169 D.170

数学推理-> 2/3,1/2,3/7,7/18,( )2/3,1/2,3/7,7/18,( )A.5/9 B.4/11C.3/13 D.2/55,5,14,38,87,( )A.167 B.168C.169 D.170
B分母为等差数列,6,10,14,18,22分子等差数列,4,5,6,7,8,所以是8/22=4/11A差是0 9 24 491^2-1=03^2=95^2-1=247^7=499^2-1=80所以是87+80=167
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