[tex]7a)\\\\\frac{\boxed{}}{\boxed{}}*\frac{2}{3}=\frac{3}{5}\\\\\frac{\boxed{}}{\boxed{}}=\frac{3}{5}:\frac{2}{3}\\\\\frac{\boxed{}}{\boxed{}}=\frac{3}{5}*\frac{3}{2}\\\\\frac{\boxed{}}{\boxed{}}=\frac{9}{10}[/tex]
[tex]b)\\\\1\frac{1}{3}*\frac{\boxed{}}{\boxed{}} =\frac{1}{4}\\\\ \frac{4}{3}*\frac{\boxed{}}{\boxed{}} =\frac{1}{4}\\\\\frac{\boxed{}}{\boxed{}}=\frac{1}{4}:\frac{4}{3}\\\\\frac{\boxed{}}{\boxed{}}=\frac{1}{4}*\frac{3}{4}\\\\\frac{\boxed{}}{\boxed{}}=\frac{3}{16}[/tex]
[tex]c)\\\\ \frac{10}{11}*\frac{\boxed{}}{\boxed{}} =2\frac{1}{2}\\\\ \frac{10}{11}*\frac{\boxed{}}{\boxed{}} =\frac{5}{2}\\\\\frac{\boxed{}}{\boxed{}}=\frac{5}{2}:\frac{10}{11}\\\\\frac{\boxed{}}{\boxed{}}=\frac{\not{5}^1}{2}*\frac{11}{\not{10}^2}\\\\\frac{\boxed{}}{\boxed{}}=\frac{11}{4}=2\frac{3}{4}[/tex]
[tex]8)\\\\a)\\\\( \frac{2}{3}- \frac{1}{4})*3\frac{1}{5}=( \frac{8}{12}- \frac{3}{12})* \frac{16}{5}=\frac{\not{5}^1}{\not{12}^3}*\frac{\not{16}^4}{\not{5}^1}=\frac{4}{3}=1\frac{1}{3}[/tex]
[tex]b)\\\\ 3*2\frac{2}{3}-( 1\frac{1}{6})^2=\not{3}^1*\frac{8}{\not{3}^1}-(\frac{7}{6})^2=9-\frac{49}{36}=6\frac{72}{36}-\frac{49}{36}=6\frac{23}{36}[/tex]
[tex]c)\\\\1\frac{4}{5}*( 3\frac{2}{3}-1\frac{5}{6})+(\frac{1}{2})^3 = \frac{9}{5}*( \frac{11}{3}- \frac{11}{6})+ \frac{1}{8} =\frac{9}{5}*( \frac{22}{6}- \frac{11}{6})+ \frac{1}{8} =\\\\=\frac{\not{9}^3}{5}*\frac{11}{\not{6}^2}+\frac{1}{8}=\frac{33}{10}+\frac{1}{8}=\frac{132}{40}+\frac{5}{40}=\frac{137}{40}=3\frac{17}{40}[/tex]
