Question

x=10-¹ e y=-(5)-² . O valor de x+y é?

Answer 1

$x=10^{-1}\\y=-(5)^{-2}=-(\frac{1}{25})=\frac{-1}{25}\\x+y=\frac{1}{10}+\frac{-1}{25}=\frac{25-10}{250}=\frac{15}{250}=\frac{3.5}{5.50}=\frac{3}{50}$