2,-1,1,0.5,2,5.5,()数字推理

问题描述:

2,-1,1,0.5,2,5.5,()数字推理
2,-1,1,0.5,2,5.5,()
A.17.5
B.17.75
C.18.5
D.18.75

答案是18.5
由前两项推第三项
2 + (-1)x 1 = 1
-1 + (1) x 1.5 = 0.5
1 + (0.5)x 2 = 2
0.5+ (2)x 2.5 = 5.5
2 + (5.5)x 3 = 18.5