[tex]3.5 \div 1.5 \times 0.4 = \frac{35}{10} \times \frac{10}{15} \times 0.4 = \frac{350}{150} \times \frac{4}{10} = \frac{1400}{1500} = \frac{14}{15} [/tex]
[tex](6 \frac{2}{5} - 2.7) \times (4.2 + 2 \frac{1}{2} ) \div \frac{1}{5} = (6.4 - 2.7)(4.2 + 2.5) \div \frac{1}{5} = 3.7 \times6.7 \times 5 = 24.79 \times 5 = 123.95[/tex]
[tex]5 \frac{2}{3} + 1 \frac{1}{4} \times 0.3 = 5 \frac{2}{3} + 1.25 \times 0.3 = 5 \frac{2}{3} + 0.375 = 5 \frac{2}{3} + \frac{3}{8} = 5 \frac{16}{24} + \frac{9}{24} = 5 \frac{25}{24} = 6 \frac{1}{24} [/tex]
