[tex]\bold{a)} \ \frac{7}{8}\cdot \frac{2}{5}=\frac{7}{20}; \\\\ \bold{b)} \ \frac{36}{44} \cdot \frac{11}{12}=\frac{3}{4}; \\ \\ \bold{c)} \ 3\frac{12}{16}\cdot \frac{4}{10}=\frac{60}{16}\cdot \frac{4}{10}=\frac{6}{4}=\frac{3}{2}; \\ \\ \bold{d)} \ 2\frac{1}{4} \cdot 1\frac{23}{45}=\frac{9}{4}\cdot \frac{68}{45}=\frac{17}{5};[/tex]
