Question

Reduce las expresiones utilizando la estrategia que más te convenga.
1. (28) – (–28) – (98) – (–42)
2. (38) – (–42) – (–48) – (50)
3. (18) + (–15) + (–7) + (–18) + (15)
4. (9) + (5) + (–12) + (–5) + (18) + (–9)
5. (–127) + (–120) + (330) + (80) + (127) + (–330) + (–90) + (40)
6. (–1230) + (–770) + (130) + (–2000) + (–3000) + (5000) + (2000)

Answer 1

1: 28+28-98+42
56-56=0

2:38+42+48-50
80-2=78

3:18-15-7-18+15
3-10=-7

4:9+5-12-5+18-9
14-17+9
-3+9=6

5:-127-120+330+80+127-330-90+40
-247+410-203-50
163-253=-90

6:-1230-770+130-2000-3000+5000+2000
-2000-1870+2000+2000
-3870+4000=130