Exercício sobre álgebra elementar

Calcular o seguinte:

$\phantom{X}\left(\sqrt{9\,\times\,9}\right)^{\large 2}\phantom{X}$

$\phantom{X}\left(\sqrt{3\,\times\,27}\right)^{\large 2}\phantom{X}$

$\phantom{X}\left(\sqrt{6^{\large 2}}\right)^{\large 2}\phantom{X}$

$\phantom{X}\dfrac{\sqrt{27\,-\,27}}{\sqrt{81}}\phantom{X}$

$\phantom{X}\sqrt{2\,\times\,2}\,+\,\sqrt{49}\phantom{X}$

$\phantom{X}\sqrt{7\,\times\,7}\,-\,\sqrt{100}\phantom{X}$

$\phantom{X}\dfrac{\sqrt{20^{\large 2}}}{\sqrt{81}}\phantom{X}$

$\phantom{X}\left(\sqrt{5^{\large 2}}\right)^{\large 2}\phantom{X}$

$\phantom{X}\dfrac{\sqrt{0\,+\,0}}{\sqrt{25}}\phantom{X}$

$\phantom{X}\sqrt{49}\,\times\,\sqrt{140\,-\,76}\phantom{X}$

resposta: a.81 b.81 c.36 d.0 e.9 f.-3 g.20/9 h.25 i.0 j.56
×