Question

gente, preciso de ajuda da questão 3 e 4, me ajudem.

Answer 1

$\frac{ \sqrt{28}+\sqrt{175} }{\sqrt{63}} \times \frac{\sqrt{63}}{\sqrt{63}} = \frac{\sqrt{63}(\sqrt{28}+\sqrt{175})}{63} = \frac{\sqrt{1764}+\sqrt{11025}}{63} = \frac{147}{63} = \frac{7}{3}$

$\frac{ \sqrt{48}}{4} + \frac{ \sqrt{243}}{2} - \frac{ \sqrt{12}}{2} = \frac{ 2\sqrt{48} + \sqrt{243} - \sqrt{12} }{2} = \frac{8\sqrt{3} + 9\sqrt{3} - 2\sqrt{3}}{2} = \frac{15\sqrt{3}}{2}$