Question

Calcule o valor dos seguintes expressões:
a) (-5+9)+[-4+(5-2+6)-9]-(1-7)
b) -20+{-5+[(-12+30)+(-4-7)]}
c) -4+(5-6)+5-[3-(2-3)+]+8-9
d) -18+{-2-[10-4+(-1-5)+11]}-6
e) 13-[-1-(5-6-7)]-2+[-3-(4-6)+2]
f) -{7+11-[(-5+11)-8]}+[-10-(2-17)]}

Answer 1

a) (-5+9)+[-4+(5-2+6)-9]-(1-7)
(4) + [-4+9] - (-6)
4 + 5 + 6
15

b) -20+{-5+[(-12+30)+(-4-7)]}
-20 + {-5+[18 - 11]}
-20 + {-5+ 7}
-20 + 2
-18

c) -4+(5-6)+5-[3-(2-3)+]+8-9
-4 - 1 + 5 - [3+1] -1
0 - 4 - 1
-5

d) -18+{-2-[10-4+(-1-5)+11]}-6
-18+{-2-[6+(-6)+11]}-6
-18+{-2-11}-6
-18 - 13 -6
37

e) 13-[-1-(5-6-7)]-2+[-3-(4-6)+2]
13-[-1-(-8)]-2+[-3-(-2)+2]
13-[-1+8]-2+[-3+2+2]
13 -[7] -2 + 1
13 -7 - 2 +1
5

f) -{7+11-[(-5+11)-8]}+[-10-(2-17)]}
-{18-[6-8]}+[-10-(-15)]}
-{18-[-2]}+[-10+15]}
-{18-[-2]}+5}
-{18+2}+5}
-20 + 5
-15