[tex]\displaystyle\\ 1)~0,\!5(342)=\frac{5342-5}{9990}=\frac{5337^{(9}}{9990}=\boxed{\frac{593}{1110}}\\\\ 2)~5,\!24(32)=\frac{52432-524}{9900}=\boxed{\frac{51908}{9900}} \\\\ 3)~3,\!(14)=\frac{314-3}{99}=\boxed{\frac{311}{99}} \\\\ 4)~-2,\!(412)=-\frac{2412-2}{999}=\boxed{-\frac{2410}{999}} \\\\[/tex]