471. 2/3,8/9,4/3,2,()
A.125 B.23/9 C.25/9 D.26/9
解析:12/18,16/18,24/18,36/18,52/18
16-12=4
24-16=8
36-24=12
52-36=16
472. 1, 2, 8, 24 , 7 , 35 , 4 , 28 , 2 , ( )
A.6 B.22 C.30 D.40
解析:两项看做一组,相除是个质数列
473. 5,9,14,27,48,86,( )
A.170 B.162 C.157 D.134
解析:5+9+14-1=27
9+14+27-2=48
14+27+48-3=86
27+48+86-4=157
474. 1 , 3, 4, 1, 9, ( )
A.5 B.11 C.14 D.64
解析:(3-1)^2=4
(4-3)^2=1
(1-4)^2=9
(9-1)^2=64
475. 2,7,14,21,294,?
解析:2×7=14
7+14=21
14×21=294
21+294=315
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