Question

a)-3+4+8-9+1=

b)21-7-9-12-6-10+15=

c)-4+(5-7+2)-(-1+15)=

Answer 1

Explicação passo-a-passo:

a)

-3+4+8-9+1

+1 -1 +1

0 +1

1 ←

b)

21-7-9-12-6-10+15

14 -21 -16 +15

-7 -1

-8 ←

c)

-4+(5-7+2)-(-1+15)

-4+(-2+2)-(+14)

-4+(0)-(+14)

-4+0-14

-4-14

-18 ←