(1) 1,7,8,57,121 (2)7,9,-1,5,-3 (3)4,2,2,3,6,15
问题描述：
(1) 1,7,8,57,121 (2)7,9,-1,5,-3 (3)4,2,2,3,6,15
答
(1) 1，7，8，57，121
8=7+1^2
57=8+7^2
121=57+8^2
(2)7,9,-1,5,-3
7+9=16
9+(-1)=8
(-1)+5=4
5+(-3)=2
(3)4,2,2,3,6,15
2/4=0.5
2/2=1
3/2=1.5
6/3=2
15/6=2.5
答
(1)1+7=8;1+7*8=57;(1+7)*8+57=121
答
(1) 1,7,8,57,121规律：1^2＋7＝8,7^2＋8＝57,8^2＋57＝121(2)7,9,-1,5,-3 规律：(7－9)÷2＝-1,(9－(-1))÷2＝5,(-1－5)÷2＝-3(3)4,2,2,3,6,15规律：4×0.5＝2,2×1＝2,2×1.5＝3,3×2＝6,6×2.5＝15...