a)
3\frac{1}{5}:3\frac{1}{3}:8=\frac{16}{5}:\frac{10}{3}:8=\frac{16}{5}*\frac{3}{10}:8=\frac{8}{5}*\frac{3}{5}:8=\frac{24}{25}:8=\frac{24}{25*8}=\frac{3}{25}=0,12
1\frac{1}{5}*2\frac{5}{8}:2\frac{1}{3}=\frac{6}{5}*\frac{21}{8}:\frac{7}{3}=\frac{3}{5}*\frac{21}{4}:\frac{7}{3}=\frac{63}{20}*\frac{3}{7}=\frac{9}{20}*3=\frac{27}{20}=1,35
10:1\frac{2}{3}*2\frac{3}{4}=10*\frac{3}{5}*\frac{11}{4}=6*\frac{11}{4}=\frac{33}{2}=16,5