4 1/2 : 1,5 - 1,75 × 1 1/3=

[tex] \frac{45}{10} \times \frac{10}{15} = \frac{450}{150 } = 3[/tex]
[tex] \frac{175}{100} \times \frac{4}{3} = \frac{7}{4} \times \frac{4}{3} = \frac{7}{3} = \: 2 \frac{1}{3} [/tex]
[tex]3 - 2 \frac{1}{3} = 2 \frac{3}{3} - 2 \frac{1}{3} = \frac{2}{3} [/tex]