[tex]1. \: \: \frac{4}{5} \div 0.2 \times 1 \frac{1}{2} \\ \\ = \frac{4}{5} \div \frac{2}{10} \times \frac{3}{2} \\ \\ = \frac{4}{5} \div \frac{1}{5} \times \frac{3}{2} \\ \\ = \frac{4}{5} \times \frac{5}{1} \times \frac{3}{2} \\ \\ = \frac{6}{1} = 6[/tex]
[tex]2. \: \: \frac{3}{4} + 0.6 \times 1 \frac{2}{3} \\ \\ = \frac{3}{4} + \frac{6}{10} \times \frac{5}{3} \\ \\ = \frac{3}{4} + (\frac{3}{5} \times \frac{5}{3} ) \\ \\ = \frac{3}{4} + \frac{1}{1} = \frac{3 + 4}{4} = \frac{7}{4} = 1 \frac{3}{4} [/tex]
[tex]3. \: \:( \frac{7}{8} \div \frac{8}{15} )- \frac{13}{24} \\ \\ = ( \frac{7}{8} \times \frac{15}{8} ) - \frac{13}{24} \\ \\ = \frac{105}{64} - \frac{13}{24} = \frac{315 - 104}{192} = \frac{211}{192} = 1 \frac{19}{192} [/tex]
