Question

Calcule o valor das expressões

a) 60-21-(18+42)-(1+9)

b) 10-[-5-(2-6)+4]

c) 18-[-4+6-(-3+1)]

d) -3+ [+1-(+4-1)+1]

e) 10- {-2+[1+(+4)-8]}

f) 3- {-5-[6-2+(-6+9)]}

g) 12- {5-3+[8-(-3-1)-(-5)]}

Answer 1

a) 60-21-(18+42)-(1+9)
60-21-60-10
-31

b)10-[-5-(2-6)+4]
10-[-5-(-4)+4]
10-[-5+4+4]
10- 3
7

c) 18-[-4+6-(-3+1)]
18-[-4+6+2]
18-4
14

d) -3+[1-(4-1)+1]
-3+[1-3+1]
-3+(-1)
-3-1
-4

e) 10- {-2+[1+(4)-8]}
10- {-2+[-3]}
10- {-2-3}
10- {-5}
10+5
15

f) 3- {-5-[6-2+(-6+9)]}
3- {-5-[6-2+3]}
3- {-5-7}
3- {-12}
3+12
15

g) 12- {5-3+[8-(-3-1)-(-5)]}
12- {5-3+[8-(-4)-(-5)]}
12- {5-3+[8+4+5]}
12- {5-3+[17]}
12- { 5-3+17}
12-19
-7

Answer 2

$A)60-21-(18+42)-(1+9)\\ 39-60-10\\ -21-10\\ =\ \textgreater \ \boxed{-31}\\\\\\ B)10-[-5-(2-6)+4]\\ 10-[-5-(-4)+4]\\ 10-[-5+4+4]\\ 10-[+3]\\10-3\\=\ \textgreater \ \boxed{7}\\\\\\ C)18-[-4+6-(-3+1)]\\ 18-[+2-(-2)]\\ 18-[2+2]\\ 18-4\\=\ \textgreater \ \boxed{14}\\\\\\ D)-3+[+1-(+4-1)+1]\\ -3+[1-3+1]\\ -3+[-1]\\ =\ \textgreater \ \boxed{-4}\\\\\\ E)10-\{-2+[1+(+4)-8]\}\\ 10-\{-2+[1+4-8]\}\\ 10-\{-2+[-3]\}\\ 10-\{-5\}\\ 10+5\\ =\ \textgreater \ \boxed{15}\\\\\\ F)3-\{-5-[6-2+(-6+6)]\}\\ 3-\{-5-[4+(0)]\}\\ 3-\{-5-4\}\\ 3-\{-9\}\\ 3+9\\=\ \textgreater \ \boxed{12}$

$G)12-\{5-3+[8-(-3-1)-(-5)]\}\\ 12-\{2+[8-(-4)+5]\}\\ 12-\{2+[8+4+5]\}\\12-\{2+17\}\\12-19\\=\ \textgreater \ \boxed{-7}$