单项选择题
1,1/4,1/9,1/16,( )A.1/22B.1/23C.1/24D.1/25
单项选择题1,1/4,1/9,1/16,( )
2/3,1/2,2/5,1/3,2/7,( )A.1/6B.2/11C.1/4D.2/9
单项选择题2/3,1/2,2/5,1/3,2/7,( )
6,14,30,62,( )A.85B.92C.126D.250
单项选择题6,14,30,62,( )