6/ (36 + 79) + (145 – 79 – 36)
7/ 10 - [12 - (- 9 - 1)]
8/ (38 – 29 + 43)- (43 +38)
9/ 271 - [(-43) + 271 – (-17)]
10/ -144 - [29 – (+144) – (+144)]
Bài 7: Tính nhanh
1/ 35. 18 – 5. 7. 28
2/ 45 - 5. (12 + 9)
3/ 24. (16 + 5) – 16. (24 - 5)
4/ 29. (19 – 13) – 19. (29 – 13)
5/ 31. (-18) + ...
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