Question

54. Calcule o valor de cada expressão numérica
a) 20 + (-15 - (-5-8)] =
b) 15 - (13 + 11) - [12 - (8 - 13)] -
c) {[15 - 23 + 10) - (30 - 42)} + (-6)=
d) {10 - [5+ (-8-3)] - 2 + (7 - 9)} + (+5)=​

Answer 1

Resposta:

$a) 20 + [(-15 - (-5-8)]$

$20+[-15-(-13)]$

$20+(-15+13)$

$20+(-2)$

$20-2$

$18$

$b) 15 - (13 + 11) - [12 - (8 - 13)]$

$15-24-[(12-(-5)]$

$15-24-(12+5)$

$15-24-17$

$-26$

$c){[15 - 23 + 10) - (30 - 42)} + (-6)$

$[(2-(-12)]-6$

$(2+12)-6$

$14-6$

$8$

$d){10 - [5+ (-8-3)] - 2 + (7 - 9)} + (+5)$

$[(10-(5+(-11)-2+(-2)]+5$

$(10-(5-11)-2-2)+5$

$(10+6-2-2)+5$

$12+5$

$17$