27)
[tex] \frac{3}{2} \times \frac{4}{10} \times \frac{50}{1 \times 2} = \\ = \frac{3}{2} \times \frac{2}{5} \times \frac{50}{2} = \\ = \frac{3}{5} \times \frac{50}{2} = \\ = \frac{150}{10} = \\ = 15[/tex]
28)
[tex]1 + \frac{1}{2} \times \frac{1}{ \frac{25}{100}} = \\ = 1 + \frac{1}{2} \times \frac{1}{ \frac{1}{4} } = \\ = 1 + \frac{1}{2} \times \frac{1}{ {4}^{ - 1} } = \\ = 1 + \frac{1}{2} \times 4 = \\ = 1 + 2 = \\ = 3[/tex]
29) aici nu mai stiu cum se introduc intregii in fractie, daca imi spui te ajut
30)
[tex] \frac{375}{1000} \times ( \frac{25}{100 } - \frac{1}{6} ) \times ( \frac{2}{10} + \frac{1}{3} ) = \\ = \frac{15}{40} \times ( \frac{1}{4} - \frac{1}{6} ) \times ( \frac{1}{5} + \frac{1}{3} ) = \\ = \frac{15}{40} \times \frac{1}{12} \times \frac{8}{15} = \\ = \frac{1}{12} \times \frac{8}{40} = \\ = \frac{1}{12} \times \frac{1}{5} = \\ = \frac{1}{60} [/tex]
