Question

resolva a expressão 1/5^-2 : 5^0 - 1/3^-2 × (0,25)^0

Answer 1

$= ({ \frac{1}{5} })^{2}\div {5}^{0} - ({ \frac{1}{3} })^{2} \times ( {0.25})^{0}$

$= {0.2}^{2} \div1 - {0.33}^{2} \times 1$

$= 0.04 - 0.11$

$= - 0.07$