[latex]1 \frac{2}{5}*2 \frac{2}{3}-1 \frac{2}{3} *3 \frac{1}{2} [/latex]

[latex]1\frac{2}{5}* 2\frac{2}{3}-1\frac{2}{3}* 3\frac{1}{2}=-2\frac{1}{10}[/latex] [latex]1\frac{2}{5}* 2\frac{2}{3}=\frac{7}{5}*\frac{8}{3}=\frac{7*8}{5*3}=\frac{56}{15}=3\frac{11}{15}[/latex] [latex]1\frac{2}{3}* 3\frac{1}{2}=\frac{5}{3}*\frac{7}{2}=\frac{5*7}{3*2}=\frac{35}{6}=5\frac{5}{6}[/latex] [latex]3\frac{11}{15}-5\frac{5}{6}=\frac{56}{15}-\frac{35}{6}=\frac{112}{30}-\frac{175}{30}=-\frac{63}{30}=-2\frac{1}{10}[/latex] (Наименьшее общее кратное 15 и 6 равно 30)