zad. 1
3,6+2\frac{2}{5}:1,8=3,6+\frac{12}{5}:\frac{18}{10}=3,6+\frac{12}{5}*\frac{10}{18}=3,6+\frac{2*2}{3}=3,6+\frac{4}{3}=
3\frac{6}{10}+1\frac{1}{3}=3\frac{18}{30}+1\frac{10}{30}=4\frac{28}{30}=4\frac{14}{15}
zad. 2
5 2/5 - 1,4 x 1 4/21
5\frac{2}{5}-1,4*1\frac{4}{21}=5\frac{2}{5}-\frac{14}{10}*\frac{25}{21}=5\frac{2}{5}-\frac{5}{3}=5\frac{2}{5}-1\frac{2}{3}=5\frac{6}{15}-1\frac{10}{15}=4\frac{21}{15}-1\frac{10}{15}=3\frac{11}{15}