二、能力提升

11.

12.374÷

13.

14. ×39.75+ ×46.25+ ×37.2

15.

16.1× ×2× ×3× ×…×2016×

17.2016×2018×

18.

19.2016× × ×…×

20. 6LsWFSMai+1jRv2fZ9BZRX3tq8U+cj+6sKJd+3HNkJh+ZGUbwZFq/POE3ltpnUv7