[tex]1) \\ \\ a) \frac{3}{5} \times \frac{10}{9} = \frac{3 \times 10}{5 \times 9} = { \frac{30}{45} }^{(15} = \frac{2}{3} [/tex]
[tex]b) \frac{1}{2} \times \frac{4}{5} \times \frac{15}{8} = \frac{1}{2} \times \frac{4}{5} = \frac{1 \times 4}{2 \times 5} = { \frac{4}{10} }^{(2} = \frac{2}{5} = \frac{2}{5} \times \frac{15}{8} = \frac{2 \times 15}{5 \times 8} = { \frac{30}{40} }^{(10} = \frac{3}{4} [/tex]
[tex]c) \frac{26}{15} \times \frac{10}{39} = \frac{26 \times 10}{15 \times 39} = { \frac{260}{585} }^{(65} = \frac{4}{9} [/tex]
[tex]d) \frac{4}{9} \times \frac{6}{5} \times \frac{15}{28} = \frac{4}{9} \times \frac{6}{5} = \frac{4 \times 6}{9 \times 5} = { \frac{24}{45} }^{(3} = \frac{8}{15} = \frac{8}{15} \times \frac{15}{28} = \frac{8 \times 15}{15 \times 28} = { \frac{120}{420} }^{(60} = \frac{2}{7} [/tex]
