Question

упростите выражение умоляю

Answer 1

а) $\sqrt{7} +\frac{21}{\sqrt{7}} = \frac{7+21}{\sqrt{7}}=\frac{28}{\sqrt{7}}$

б) $(\frac{6}{\sqrt{2}}+\sqrt{2})*\sqrt{2}=\frac{8}{\sqrt{2}} *\sqrt{2} =8$

в) $\frac{18}{\sqrt{3}} - 5\sqrt{3} =\frac{3}{\sqrt{3}}$

г) $(\frac{2}{\sqrt{18}} -\sqrt{2}):\frac{\sqrt{2}} {3} =\frac{-4}{\sqrt{18}}*\frac{3}{\sqrt{2}}  =-\frac{12}{6} =-2$