Question

Calcule o valor da expressão:

Answer 1

$\sqrt{\dfrac{81}{36}}-3^2 \cdot \left(\dfrac{1}{3}\right)^2 = \\\\\dfrac{\sqrt{81}}{\sqrt{36}} - 9 \cdot \dfrac{1}{3^2} = \\\\\dfrac{9}{6} - 9 \cdot \dfrac{1}{9} = \\\\\dfrac{3}{2} - \dfrac{9}{9} = \\\\\dfrac{3}{2} - 1 = \dfrac{3 -2}{2} = \dfrac{1}{2} = 0,5$