Question

Calcule o valor das expressões:
13.
2-1-(-2)2 + (-2)-1
22 + 2-2​

Answer 1

$\blue{\boxed{\begin{array}{l}\sf\dfrac{2^{-1}-(-2)^2+(-2)^{-1}}{2^2+2^{-2}}=\dfrac{\frac{1}{2}-4-\frac{1}{2}}{4+\frac{1}{4}}\\\sf\dfrac{-4}{\frac{17}{4}}=(-4)\cdot\dfrac{4}{17}=-\dfrac{16}{17}\end{array}}}$