Question

Calcule o valor das seguintes expressões a) 12 – {-5 – [6 – 2 + (-6 + 9)]} b) -7 – { -7 – [-7 – (-7 -7)]} c) -6 – {2 + [-3 – (-2 + 8)] + 0 + 2} d) 20 – {-2 + [1 + (+9 -5) – 2] + 15 – 9}

Answer 1

Resposta:

Leia abaixo

Explicação passo-a-passo:

a) 12 – {-5 – [6 – 2 + (-6 + 9)]}

12 – {-5 – [6 – 2 + (3)]}

12 – {-5 – [7]}

12 – {-12}

24

b) -7 – { -7 – [-7 – (-7 -7)]}

-7 – { -7 – [-7 – (-14)]}

-7 – { -7 – [7]}

-7 – { -14}

7

c) -6 – {2 + [-3 – (-2 + 8)] + 0 + 2}

-6 – {2 + [-3 – (-2 + 8)] + 2}

-6 – {2 + [-3 – (6)] + 2}

-6 – {2 + [-9] + 2}

-6 – {-5}

-1

d) 20 – {-2 + [1 + (+9 -5) – 2] + 15 – 9}

20 – {-2 + [1 + (+9 -5) – 2] + 6}

20 – {-2 + [1 + (4) – 2] + 6}

20 – {-2 + [3] + 6}

20 – {7}

13

Answer 2

a) 12 – {-5 – [+6 – 2 + (-6 + 9)]}

12-{-5-[+6-2+(+3)]}

12-{-5-[+4+3]}

12-{-5-[+7]}

12-{-5-7}

12-{-12}

12+12=

24

------------------------------------------

b) -7 – { -7 – [-7 – (-7 -7)]}

-7-{-7-[-7-(-14)]}

-7-{-7-[-7+14]}

-7-{-7-[+7]}

-7-{-7-7}

-7-{-14}

-7+14=

7

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c) -6 – {2 + [-3 – (-2 + 8)] + 0 + 2}

-6-{2+[-3-(+6)] +2}

-6-{2+[-3-6]+2}

-6-{2+[-9]+2}

-6-{2-9+2}

-6-{4-9}

-6-{-5}

-6+5=

-1

--------------------------------------------

d) 20 – {-2 + [1 + (+9 -5) – 2] + 15 – 9}

20-{-2+[1+(+4)-2]+6}

20-{-2+[1+4-2]+6}

20-{-2+[5-2]+6}

20-{-2+[3]+6}

20-{-2+3+6}

20-{9-2}

20-{7}

20-7=

13

BONS ESTUDOS!!!!