1. 1,5,9,14,21,( )
A. 30
B. 32
C. 34
D. 36
2.0,4,18,48,100,( )
A.140
B.160
C.180
D.200
3.2,-1,-1/2,-1/4,1/8,( )
A.-1/10
B.-1/12
C.1/16
D.-1/14
4. 65,35,17,3,( )
A.1
B.2
C.0
D.4
5. 1,6,13,( )
A.22
B.21
C.20
D.19
农商行参考答案
1.选B,1+5+3=99+5+0=149+14+(-2)=2114+21+(-3)=32,其中3、0、-2、-3二级等差
2.选C,两两相减===>?4,14,30,52 ,{()-100} 两两相减 ==>10.16,22,()==>这是二级等差=>0.4.18.48.100.180==>选择C。思路二:4=(2的2次方)×118=(3的2次方)×248=(4的2次方)×3100=(5的2次方)×4180=(6的2次方)×5
3.选C,分4组,(2,-1)(-1,-1/2)(-1/2,-1/4)(1/8,(1/16))===>每组的前项比上后项的绝对值是
4.选A, 65=8×8+135=6×6-117=4×4+13=2×2-11=0×0+1
5.选A,1=1×2+(-1)6=2×3+013=3×4+1?=4×5+2=22
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