Question

1.Calcule:

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

b) 4+(-3)+18-7×5-(-9)=

c) 5×20-100+120-120=

d) 8+9-18-20+35=

Answer 1

Bom dia. 

a) (+3)+(-5)+(2)-(-7) = 7
b) 4+(-3)+18-7×5-(-9) = -7
c) 5×20-100+120-120 = 0
d) 8+9-18-20+35 = 14

a) (+3)+(-5)+(2)-(-7) = 
3-5+2+7 = 
12-5 = 7

b) 4+(-3)+18-7×5-(-9) =
4-3+18-35+9 = 
31-38 = -7

c) 5×20-100+120-120 =
100-100+120-120 =
220-220 = 0

d) 8+9-18-20+35 =
52-38 = 14

Bons estudos! :-)