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12 - 2 + (- 7) - (- 2) + 4
12 - 2 - 7 + 2 + 4
18 - 9
9
Solución.
9
-----------------------------------------
3-(3-4)+5-(7+8)-(15-14)+(7-8)
3 - (- 1) + 5 - (15) - (1) + (- 1)
3 + 1 + 5 - 15 - 1 - 1
9 - 17
- 8
Solución.
- 8
12-2+(-7)-(-2)+4
12-2-7+2+4 =9
B: 3-(3-4)+5-(7+8)-(15-14)+(7-8)
3-(-1)+5-(15)-(1)+(-1)
3+1+5-15-1-1= -8
espero que esto te aya ayudado