Question

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Answer 1

a) √49 ÷ 8 + 12=

7 ÷ 8 + 12 =

0.875 + 12 = 12,875

b) 20 + 24 ÷ 6 =

20 + 4 = 24

c) 2 × (–3) + 15 ÷ 3 =

(–6) + 15 ÷ 3 =

(–6) + 5 = –1

d) –7 ÷ (–1) –16 ÷ (–8) + 3 =

(+7) –16 ÷ (–8) + 3 =

(+7) (+2) + 3 =

7 +2 + 3 = 12

e) [–1 + (6 × 2) ] ÷ (–11) =

[–1 + (12) ] ÷ (–11) =

[11] ÷ (–11) = –1

f) 1 + [–1 + (1 + 1)] × (–1) =

1 + [–1 + (2)] × (–1) =

1 + [1] × (–1) =

1 + (–1) = 0

g) {–3 × 7 + [ 2 × (3 – 8) + (–1) × (2 + 5)]}+ ³√8 =

{–3 × 7 + [ 2 × (– 5) + (–1) × (7)]}+ ³√8 =

{–3 × 7 + [ – 10 + (–1) × (7)]}+ ³√8 =

{–3 × 7 + [ – 10 + (–7)]}+ ³√8 =

{–3 × 7 + [ –17]}+ ³√8 =

{–21 + [ –17]}+ ³√8 =

{–38}+ ³√8 =

{–38}+ 2 = –36

*os números sublinhados em casa linha foi a operação realizada.