4. (24+ 25-25: 5x 5: 1): a = 6x 9- 7x 7+ 3
5. ax (3x 4: 6- 18: 9+ 1) = (7x 9- 6x 10): 3
7. ) (36: 9+36: 6)x10- a= 4x 4x 0: 3
8. a: (76- 6x 6- 5x 6) = 100:10+ 6x 8- 2x 9- 5x 6
20. 7x 8-40: 5+ 2x 9- 2+ 21: 3- a = 4x 2x 3+ 42: 7: 3-56: 8
Pe măsură ce rezolvi, caută mai jos şi subliniază rezultatele obținute.
Acestea sunt: 0,0,1, 1, 2, 3, 3, 4, 4, 5, 5, 9, 10, 21, 40, 40, 47, 52, 100, 100.
1.
2. (17- 7: 7- 2): 7+a=
3. 12+ 4x (36: 6- 6)- a = 72: (4x 6: 3)
50: 5- 6x 3: 9+82 = (56: 7+82)x a
2
9. 10x (64: 8)- 3x 10 = 100: 10+ 5x 8- a
10. 5x (3x 4: 6: 2): 5+ a = 35: 7- 4
11. (14: 2+ 2x 8- 3): 10+ a = 42: (35: 5)
12. (29+ 47- 2x 3): (1+ 2x 3) = (7x 8- 4x 4): a
R. 4x (48: 6): 8 = (7x 4+ 9x 5- 1): 8- a
14. (42: 7x 7- 2): 4x 10 = (5x 7 +5): 8+ 9x 10+ a
15. (1+ 1x 7+ 1x10): (40: 8+ 4): a = 45: 5: (3x 3)
16. (70: 7+ 3- 2x 6x (10: 10) = 27: 3: a
17. (29- 5x 5): 2-16: 8 = a -(76- 9x 8+ 6)
18. a: (25: 5- 24: 4: 3) = (28+ 28): 7- 4: 4
19. 9x 8-42: 6- a=81: (3x 1x 3)+27: 3
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