Question

Resolva as expressões:
a) (+4) + (+1) + (+8) =
b) (-9) + (-4) + (-3) =
c) (+3) + (-10) =
d) (-5) – (+8) =
e) (+3) – (+5) =
f) (-1) – (-2) =

Answer 1

$a) (+4) + (+1) + (+8) \\ 4 + 1 + 8 \\ 5 + 8 \\ \boxed{13}$

$b)( - 9) + ( - 4) + ( - 3) \\ - 9 - 4 - 3 \\ - 13 - 3 \\ \boxed{ - 16}$

$c)( + 3) + ( - 10) \\ 3 - 10 \\ \boxed{ - 7}$

$d)( - 5) - ( + 8) \\ - 5 - 8 \\ \boxed{ - 13}$

$e)( + 3) - ( + 5) \\ 3 - 5 \\ \boxed{ - 2}$

$f)( - 1) - ( - 2) \\ - 1 + 2 \\ \boxed{1}$

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