[tex]a)\\\\\frac{\not{5}^1}{\not{9}^3}*\frac{\not{3}^1}{\not{12}^4}* \frac{\not{3}^1}{\not{10}^2}=\frac{1}{24}\\\\b)\\\\\frac{5}{16}:\frac{12} {5}*\frac{8}{25}=\frac{5}{\not{16}^2}*\frac{\not{5}^1}{12} *\frac{ \not{8}^1}{\not{25}^5}=\frac{5}{120}=\frac{1}{24}\\\\c)\\\\\frac{10}{21}*\frac{1}{5}:\frac{16}{7}=\frac{\not{10}^2}{\not{21}^3}*\frac{1}{\not{5}^1}*\frac{\not{7}^1}{16}= \frac{2}{48}=\frac{1}{24}[/tex]
[tex]d)\\\\\frac{\not{7}^1}{\not{18}^3}*\frac{\not{15}^5}{\not{24}^8} *\frac{\not{6}^1}{\not{35}^5}=\frac{5}{120}=\frac{1}{24}[/tex]
