[tex]a)\\\\ -2 \frac{1}{2}*2\frac{2}{5}*(-1 \frac{1}{9})= - \frac{\not{5 }^{1 }}{\not{2}^1}* \frac{\not{12}^6}{\not{5}^1}*(- \frac{10}{9})=\frac{60}{9}= \frac{20}{3}=6\frac{2}{3}\\\\b)\\\\ -3\frac{3}{4}*(-3\frac{3}{5})*(-1 \frac{1}{9}) = - \frac{\not{15}^3}{\not{4}^2}*(- \frac{ \not{18}^2}{\not{5}^1})*(- \frac{\not{10}^5}{\not{9}^1})=-\frac{30}{2} =-\frac{15}{2}=-7\frac{1}{2}\\\\c)\\\\-2 \frac{2}{3}*(-1\frac{1}{2} )*(-1 )=- \frac{\not{8 }^{4}}{\not{3}^{1 }}*(- \frac{\not{3}^{1 }}{\not{2}^{1 }} )*(-1 )=-4\\\\4)\\\\ \frac{5}{3}*(-2 \frac{2}{5})*(-1 \frac{3}{4}) *\frac{1}{14}=\frac{\not{5}^1}{3}*(-*\frac{\not{12}^3}{\not{5}^1})*(- \frac{\not{7}^1}{\not{4}^1}) *\frac{1}{\not{14}^2}=\frac{3}{6}=\frac{1}{2}[/tex]
