单项选择题
A.100 B.75 C.25.5 D.85.5
1/2, 1/6, 1/18, 1/54, ()A.1/72B.1/112C.1/162D.1/143
单项选择题1/2, 1/6, 1/18, 1/54, ()
A.1/72 B.1/112 C.1/162 D.1/143
1, 3, 7, 15, 31, 63,()A.127B.144C.102D.104
单项选择题1, 3, 7, 15, 31, 63,()
A.127 B.144 C.102 D.104
1,8,15,22,29,()A.39B.36C.47D.40
单项选择题1,8,15,22,29,()
A.39 B.36 C.47 D.40