8.Calculați
[tex]( \frac{3}{\sqrt{12} } - \frac{15}{5 \sqrt{3} } + \frac{9}{ \sqrt{27} }) -( \frac{12}{ \sqrt{48} } + \frac{45}{ \sqrt{75} } + \frac{24}{8 \sqrt{3} } )[/tex]
pls ajutor
