Question

resolva as expressões abaixo:

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

ajudem prfv!!​

Answer 1

a) 10-[-2+(-9+3)-1]

10-[ -2+(-6)-1]

10-[ -2-6-1]

10- [-9]

10+9 => 19

b)21-[+5-(-2-3)]

21-[+5-(-5)]

21-[+5+5]

21 - [10]

21-10 => 11

c)-12+{27÷[3-(-2).(-6)]}

-12+{27÷[3+2.-6)]}

-12+{27÷[3-12]}

-12+{27÷ (-9)}

-12 + (-3)

-12 - 3 => -15