Question

Calcule 3+2-7
8+1-18
7-8+3
9+2-20

Answer 1

3+2-7= 2

7-8+3= 2

9+2-20= 9

Answer 2

Resposta:

a) -2

b) -9

c) 2

d) -9

Explicação passo-a-passo:

a) 3+2= 5 5-7= -2

b) 8+1= 9 9-18= -9

c) 7-8= -1 -1+3= 2

d) 9+2= 11 11-20= -9