Question

Preciso da resolução !

Answer 1

Algumas propriedades:

$\boxed{\boxed{(-x)^{n}\neq-x^{n}}}\\\\\\\boxed{\boxed{-x^{n}=-(x)^{n}}}\\\\\\\boxed{\boxed{\left(\dfrac{a}{b}\right)^{-n}=\left(\dfrac{b}{a}\right)^{n}}}$
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$R=-2^{2}+(\frac{1}{3})^{-2}\\\\R=-(2)^{2}+(\frac{3}{1})^{2}\\\\R=-(4)+(3)^{2}\\\\R=-4+9\\\\\boxed{\boxed{R=5}}$