Question

1) Calcule as adiçoes e as subtraçoes com numeros inteiros.
A) (+20) + (-18)=
B) (37) + (+64)=
C) (-9) - (+15)=
D) (+16) - (+20)=
E) (-1) - (-18)=

Answer 1

$a)( + 20) + ( - 18) \\ 20 - 18 \\ 2$

$b)(37) + ( + 64) \\ 37 + 64 \\ 101$

$c)( - 9) - ( + 15) \\ - 9 - 15 \\ - 24$

$d)( + 16) - ( + 20) \\ 16 - 20 \\ - 4$

$e)( - 1) - ( - 18) \\ - 1 + 18 \\ 17$