Question

1) Calcule o valor das expressões:
a) 2.7 +5.(-2) =
b) (-6).(-3)+2.(-6) =
c) 10 + 5.(-2) - 10 =
d) (-1)-5.(-1)+4.(-1 ) =​

Answer 1

a) 2 . 7 +5.(-2) =

$14 + ( - 10) = \\ 14 - 10 = \\ \red{4}$

b) (-6) . (-3)+2 . (-6) =

$+ 18 + ( - 12) = \\ 18 - 12 = \\ \red{6}$

c) 10 + 5 . (-2) - 10 =

$10 + ( - 10) - 10 = \\ 10 - 20 = \\ \red{- 10}$

d) (-1) -5 . (-1)+4 . (-1 ) =

$- 1+ 5 + ( - 4) = \\ - 1 + 5 - 4 = \\ 4 - 4 = \\ \red{0}$