1.
[tex]\frac{3}{5} \times \frac{10}{21} = \frac{30}{105} = \frac{2}{7}
[/tex]
2.
[tex] \\ \frac{3}{2} \times ( \frac{1}{3} - \frac{1}{5} ) = \frac{3}{2} \times \frac{2}{15} = \frac{6}{30} \\ = \frac{1}{5} [/tex]
3.
[tex] \\ ( \frac{3}{10} + \frac{12}{4} ) \times (\frac{2}{9} - \frac{1}{8} ) = \frac{33}{10} \times \frac{7}{72} \\ = \frac{77}{240}
[/tex]
[tex] \\ \frac{1}{4} \times ( \frac{2}{5} \times ( \frac{2}{3} + 1)) = \frac{1}{4} \times ( \frac{2}{5} \times \frac{5}{3} ) \\ \\ = \frac{1}{4} \times \frac{10}{15} = \frac{10}{60} \\ \\ = \frac{1}{6} [/tex]
