Resposta:

A) 5, B) 35 e C) 6

Explicação passo a passo:

a) 9 + (7 − 5) ÷ 2 − 10 ÷ 2 =

b) 11 + {20 − [3 − (10 − 8)] + 5} =

c) [40 − (32 + 5)] ∙ {[(12 − 8) + 10] ÷ 7}=

a) 9 + (7 − 5) ÷ 2 − 10 ÷ 2 =

9 + 2 ÷ 2 − 10 ÷ 2 --> 9 + 1 − 5 --> 10 - 5 = 5

b) 11 + {20 − [3 − (10 − 8)] + 5} =

11 + {20 − [3 − 2] + 5}

11 + {20 − 1 + 5}

11 + {19 + 5} -> 11 + 24 = 35

c) [40 − (32 + 5)] ∙ {[(12 − 8) + 10] ÷ 7}=

[40 − 37] ∙ {[4 + 10] ÷ 7}

[40 − 37] ∙ {14 ÷ 7} --> [3] ∙ {2} --> 3 . 2 = 6

Explicação passo-a-passo:

a) 9 + (7 − 5) ÷ 2 − 10 ÷ 2 =

9 + ( 2 ) / 2 - 10 / 2

9 + 1 - 5

10 - 5 = 5

b) 11 + {20 − [3 − (10 − 8)] + 5} =

11 + { 20 - [3 - (2) ] + 4}

11 + { 20 - 1 +4}

11 + {23}

44

c) [40 − (32 + 5)] ∙ {[(12 − 8) + 10] ÷ 7}

[ 40 - (37)] . {[(4) +10] / 7}

[ 3 ] . {[14] /7}

[3] . [ 14 / 7 ]

[3] . 2

3 X 2 = 6