Question

9) a) (+20).(–5)÷(–4) = b) (–20)÷(+5).(–4) = | 10) {[(2 + 5·3)·2 – 4]÷10 + 1}.(–5)​

Answer 1

Resposta:

a) (+20).(–5)÷(–4) = -100 ÷ -4 = 25

b) (–20)÷(+5).(–4) = -4 · -4 = 16

10) {[(2 + 5·3)·2 – 4]÷10 + 1}.(–5) =

{[(2 + 15)·2 – 4]÷10 + 1}.(–5) =

{[17 · 2 – 4]÷10 + 1}.(–5) =

{[34 – 4]÷10 + 1}.(–5) =

{30 ÷ 10 + 1} .(–5)=

{3 + 1}.(–5) =

4.(–5) =

-20