[tex]\displaystyle\bf\\1)\\\\\sqrt{1\frac{69}{100} } -5\sqrt{0,16} =\sqrt{\frac{169}{100} } -5\sqrt{(0,4)^{2} } =\sqrt{\Big(\frac{13}{10} \Big)^{2} } -5\cdot 0,4=\\\\\\=\frac{13}{10} -2=1,3-2=-0,7\\\\2)\\\\(-5\sqrt{3})^{2} =(-5)^{2} \cdot(\sqrt{3} )^{2} =25\cdot 3=75[/tex]