Question

3) Dados x =2^0 - 3^-1, y = 5^0 - 2^-1 e z =4^0 + 4^-1, calcule o valor de: a) x + y b)x - y c) x × z d) y ÷ z​

Answer 1

$x = 2^{0}-3^{-1} = 1-\frac{1}{3} = \frac{2}{3} ou 0,67 (dizimaperiodica) \\y = 5^{0}-2^{-1} = 1-\frac{1}{2} = \frac{1}{2} ou 0,5\\z = 4^{0}+4^{-1} = 1+\frac{1}{4} = 1+0,25 = 1,25\\\\a)x+y = 0,67+0,5 = 1,17\\b)x-y = 0,67-0,5 = 0,17\\c)x.z = 0,67.1,25 = 1,8375 aproximando 1,84\\d)y/z = 0,5/1,25 = 0,4$