(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

(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...