Question

calcule o valor das expressões abaixo -COM CÁLCULOS

a) -(-2)^4+(-2)^5.2-^3

b) (4^0:4-^1):(4-^1:4-^2)

Answer 1

a) 
$-(-2)^4+(-2)^5.2^-^3=\\-(2^4)+(-2^5). \frac{1}{2^3}=\\-2^4-2^5.\frac{1}{2^3}=\\-2^4- \frac{2^5}{2^3}=\\-2^4-2^2=\\-32-4=\\-36$

b)
$(4^0:4^-^1):(4^-^1:4^-^2)=\\(1: \frac{1}{4} ):( \frac{1}{4}: \frac{1}{4^2} )=\\(1.4):( \frac{1}{4}.4^2 )=\\4: \frac{4^2}{4}=\\4:4=\\1$