3,4,17/3 ,( ),57/5。 A. 27/4B. 23/3C. 8D. 21/2
3,4,17/3 ,( ),57/5。
A. 27/4
B. 23/3
C. 8
D. 21/2
B. 23/3
C. 8
D. 21/2
参考解析
解析:解题指导: 各项可化为(12+2)/1, (22+4)/2, (32+8)/3, (42+16)/4 , (52+32)/5。故答案为C。
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