486. 2,15,7,40,77,()
A.96 B.126 C.138 D.156
解析:15-2=13=4^2-3
40-7=33=6^2-3
138-77=61=8^2-3
487. 0.5,2,9/2,8,(12.5)
A.11 B.11.5 C.12 D.12.5
解析:各项均×2 得新数列1,4,9,16,25
又为1^2,2^2,3^2,4^2,5^2
488. 1,6,30,(120),360
解析:1×6=6, 6×5=30, 30×4=120, 120×3=360
489. 0,9,26,65,(124),217
解析:1^3 –1, 2^3 +1, 3^3 –1, 4^3 +1, 5^3 -1
490. 36,24,(16),32/3,64/9
解析:两两相除=1.5
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