2/5,11/18,16/21,7/8,26/27,( )A.31/30 B.30/32 C.33/60 D.34/64

admin2020-12-24  6

问题 2/5,11/18,16/21,7/8,26/27,(  )

选项 A.31/30
B.30/32
C.33/60
D.34/64

答案A

解析数列分子、分母呈递增趋势,优先反约分,将数列转化为单调递增。原数列可转化为:6/15,11/18,16/21,21/24,26/27?,(),分母为公差是3的等差数列,分子为公差是5的等差数列,则所求项=26+5/27+3=31/30。 故正确答案为A。
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