Question

Calcule o valor das expressoes numericas:
a)3^-2+2^-3
b)5^2+2^4.4^-1
c)(3,1)^-1x3 1/10

Answer 1

$a) \\ 3^{-2}+2^{-3}=\frac{1}{9}+\frac{1}{8}=\frac{17}{72}\\ \\ b)\\ 5^2+2^4.4^{-1}=25+16.\frac{1}{4}=25+4=29\\ \\ c)\\ (3,1)^{-1}.\frac{31}{10}=\frac{1}{3,1}.\frac{31}{10}=0,1$

Answer 2

Olá

a)3^-2+2^-3
  ( 1/3)²+( 1/2)³
    1/9+1/8= mmc de 8, 9=72
      8+9/81=17/72

b)5^2+2^4.4^-1
    25 +2^4.1/4
    25 + 16.1/4
    25+ 4=29

c)(3,1)^-1x3 1/10
   1/3.31/10=
   31/10=0,1