奥数速算专题练习

1.37+56+63+44

2.284+178

3.89+91+90+92+88+87+93+92+87

4.4996+3993+2992+1991+98

5.1800-90-176-10-24

6.125?13?4?8?25?5?2

7.1999+999?999

8.321?654?987?654?987?321

9.9999?2222+3333?3334

10.1-2+3-4+5-6+…+1991-1992+1993

11.947+(372-447)-572

12.987-178-222-390

13.325+46-125+54

14.567+558+562+555+563

15.100+99-98+97-96+…+3-2+1

16.（123456＋234561＋345612＋456123＋561234＋612345）÷6

17.1994×19931993-1992×19941994

18.计算：1+2-3-4+5+6-7-8+9+10-…+1994

19.计算：4726342+4726352-472633×472635- 472634×472636