Question

1) Efetue
a)-1-2-3=
b)-4-5-8+10=
c )-7+20-15+20-1=
d)-8-10-7+13-14+5-6=
e)-13+7-9+-13=
f)-20+10-10+20+14-13-1=
g)-8-10+17-3+4-7+8-1=
h)-6-7-13-26+54-2=​

Answer 1

a) -1 -2 -3 = – 6

b) -4 -5 -8 +10 =

–9 –8 + 10 =

– 17 + 10 =

– 7

c) -7 +20 -15 +20 -1 =

13 – 15 + 20 – 1 =

– 2 + 20 – 1 =

– 3 + 20 =

17

d) -8 -10 -7 +13 -14 +5 -6 =

–18 – 7 + 13 – 14 + 5 – 6 =

–25 + 13 – 14 + 5 – 6 =

– 8 – 9 – 6 =

–17 – 6 =

23

e) -13 +7 -9 + -13 =

–6 –9 – 13 =

28

f) -20 +10 -10 +20 +14 -13 -1 =

–10 – 10 + 20 + 14 – 13 –1 =

–20 + 20 + 14 –13 –1 =

0 + 14 – 13 – 1 =

+ 14 – 14 =

0

g) -8 -10 +17 -3 +4 -7 +8 -1 =

– 18 + 17 – 3 + 4 – 7 + 8 – 1 =

–1 – 3 + 4 – 7 + 8 – 1 =

–4 + 4 – 7 + 7 =

0

h) -6 -7 -13 -26 +54 -2 =

– 13 – 13 - 26 + 54 – 2 =

– 26 – 26 + 54 – 2 =

–52 + 54 – 2 =

2 – 2 =

0