1、40/81,37/27,34/9,( )
A.31/3 B.33/2 C.31/6 D.2/9
2、5,10,15,25,40,()
A.75 B.85 C.55 D.65
3、-1, 1,7, 17, 31, () ,71
A.41 B.37 C.49 D.50
4、10,9,17,50,( )
A.69 B.110 C.154 D.199
5、3,6,15,42,( )
A.120 B.121 C.123 D. 124
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