A组部分:(1)(-5)× (2) (3) (4) (5)—2+6 (6)0— (7) (8)—2—6 (9) (10) (11) (12) (13) (14)0-(-10)+4-(-5)+(+6.2) (15)(- )-(+5 )-(- )-(-8 ) (16) (17) (18)-5-5-3+(-3)(19)-4.2+5.7-8.4-2.3 (20)|-0.2|-|-3-(+8)|-|-8-2+10|(21) (22) (23)81.26-293.8+8.74+111 (24) (25) ; (26 ) (27) ; (28) (29) + + + (30) + (31) ; (32) (33) (34)8 + (35) (36)100 (37) (38) (39) (40) (41) (42) (43) (44) ;(45) ; (46) B组部分1. 2. ;3. 4. 5. -9+5×(-6) -(-4)2÷(-8) 6. 7. 100 8. 9. 10. 11. 12. 13. 14. 15. 16.1 + 2+3+…+1997+1998+1999 17. 18. ; 19. 20. 21. 。22. 。 23. 24. 25. 26. 53 |