Question

        2) Efetue as expressões numéricas:
a) 2 + 6 – 8 =
b) 2 {3 + 1 [7 – 4 (6. 2)] – 15}=
c) – 2 + 6 – 12 – 4 =
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Answer 1

Resposta:

2)

a) 0

b) -106

c) -12

Explicação:

2)

a) 2+6-8 =

8-8 =

0

b) 2×{3+1×[7-4×(6×2)]-15} =

2×{3+1×[7-4×12]-15} =

2×{3+1×[7-48]-15} =

2×{3+1×[-41]-15} =

2×{3-41-15} =

2×{-38-15} =

2×{-53} =

-106

c) -2+6-12-4 =

4-12-4 =

-8-4 =

-12