Question

6). Determine o valor da soma algébrica:

a) – (+9 – 15 + 19)
b) 5 + (– 12 +16 – 18)
c) – 42 – (–28 +42 –14)
d) – 34 – (+64 – 82 +26)
e) – (+18) + (–15) + (+19) + (–12)

Answer 1

Resposta:

Explicação passo-a-passo:

a)  – (+9 – 15 + 19) => – (+9 + 19 – 15 ) => – ( + 28 – 15 ) => – ( + 13 ) = -13

b) 5 + (– 12 +16 – 18)=> 5 + (– 12 – 18 +16 )=> 5 + (– 30 +16 )=> 5 + (+14 )=> 5 + 14 = +19

c) – 42 – (–28 +42 –14)=> – 42 – (–28 –14 + 42 )=>– 42 – (–42 + 42 )=>

– 42 – (0 ) = -42

d) – 34 – (+64 – 82 +26)=> – 34 – (+64 +26 – 82 )=> – 34 – (+90 – 82 )=>

– 34 – (+8 )=> – 34 – 8 => - 42

e) – (+18) + (–15) + (+19) + (–12)=> – 18 –15 + 19 – 12 => – 18 –15 – 12  + 19=>

– 45 + 19 = - 26