2 примера)
(4/15 + 19/25) * 6/7
(5/22 - 8/11) * 11/5

[tex] (\frac{(5*4)+(3*19)}{75} } )*6/7= \frac{77}{75} * \frac{6}{7} = \frac{66}{75} [/tex]
[tex] (\frac{5-(2*8)}{22} [/tex])*11/5=[tex]- \frac{11}{22} * \frac{11}{5} =- \frac{22}{5} [/tex]