Question

Resolva as expressões abaixo
a) 10-[-2+(9+3)-1]
b) 21-[+5-(-2-3)]
c) -12+{27÷[3-(-2).(-6)]}

Answer 1

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$\large\boxed{\begin{array}{l}\rm a)~\sf10-[-2+(9+3)-1]\\\sf=10-[-2+12-1]\\\sf=10-[9]=10-9=1\\\rm b)~\sf21-[+5-(-2-3)]\\\sf=21-[+5-(-5)]\\\sf=21-[5+5]\\\sf=21-[10]=21-10=11\\\rm c)~\sf-12+\{27\div[3-(-2)\cdot(-6)]\}\\\sf=-12+\{27\div[3-(+12)]\}\\\sf=-12+\{27\div[3-12]\}\\\sf=-12+\{27\div[-9]\}\\\sf=-12+\{-3\}\\\sf=-12-3=-15\end{array}}$