Решите по действиям : (6целых 7.12- 3целых 17.36)* 1.2 - 4целых 1.3 : 13.20 

1) [latex]6\frac{7}{12} - 3 \frac{17}{36}=6\frac{21}{36} - 3 \frac{17}{36}=3\frac{4}{36}=3 \frac{1}{9}[/latex]; 2) [latex]3 \frac{1}{9} * 1.2= 3 \frac{1}{9} * 1 \frac{2}{10} = \frac{28}{9}*\frac{12}{10}=\frac{56}{15}= 3 \frac{11}{15}[/latex]; 3) [latex]4 \frac{1}{3} : \frac{13}{20}= \frac{13}{3}* \frac{20}{13}= \frac{20}{3}=6 \frac{2}{3}[/latex]; 4) [latex]3 \frac{11}{15 } -6 \frac{2}{3} = 3 \frac{11}{15 } - 6 \frac{10}{15 } = - 2 \frac{14}{15 }[/latex]