cuánto es -7-4-12-8+4-9+1=,
2. -1-2-3-4-5-6-7-8-9=,
3. 11-(8+14-7)=,
4. 10-(8-7)+(-9-3)=
5. 15-[7-(3)]=,
6. (-8-2)-(6-3)=
7. -2-[7-(-7)+(-1)]
por fa ayudenme​