476. 1,3/2,11/6,25/12,( B )
A.133/60 B.137/60 C.141/60 D.147/60
解析:3/2-2/2=1/2
11/6-3/2=1/3
25/12-11/6=1/4
1/5+25/12=137/60
477. 8, 12,16,16,( ),-64
A.0 B.4 C.-8 D.12
解析:(12-8)×4=16
(16-12)×4=16
(16-16)×4=0
(0-16)×4=-64
478. 0, 2, 8, 15,( )
A.24 B.25 C.26 D.27
解析:0+2+6=8
2+8+5=15
8+15+4=27
依次是相邻两项加6,5,4 等于第三项
479. 7,18,40,84, ()
A.162 B.160 C.152 D.150
解析:7=2×3+1,18=3×5+3,40=5×7+5,
84=7×11+7,?=11×13+9=152
480. 1,2,3,7,16,(),321
A.66 B.65 C.64 D.63
解析:1^2+2=3
2^2+3=7
3^2+7=16
7^2+16=65
16^2+65=321
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