Помогите пожалуйста. плиз. No-584 (2;4;6) очень надо.

2.
$( \frac{7}{12} - \frac{1}{3} ) \times \frac{16}{19} = \frac{7 - 4}{12} \times \frac{16}{9} = \frac{3}{12} \times \frac{16}{9} = \frac{1}{4} \times \frac{16}{19} = \frac{16}{4 \times 19} = \frac{4}{19}$
4.
$( \frac{11}{24} + \frac{1}{6} ) \times \frac{8}{5} = ( \frac{11 + 4}{24} ) \times \frac{8}{5} = \frac{15}{24} \times \frac{8}{5} = \frac{5}{8} \times \frac{8}{5} = 1$
6.
$(7 - 2 \frac{5}{16} ) \times \frac{4}{25} = ( \frac{7}{1} - \frac{37}{16} ) \times \frac{4}{25} = ( \frac{112 - 37}{16} ) \times \frac{4}{25} = \frac{75 \times 4}{16 \times 25} = \frac{3}{4}$