выполните действия: 4/9 x 15/28 , 1 3/11 x 1 9/35

[tex] \frac{4}{9} \times \frac{15}{28} = \frac{4 \times 3 \times 5}{3 \times 3 \times 7 \times 4} = \frac{5}{21} [/tex]
[tex]1 \frac{3}{11} \times 1\frac{9}{35} = \frac{14}{11} \times \frac{44}{35} = \\ = \frac{2 \times 7 \times 4 \times 11}{11 \times 5 \times 7} = \frac{8}{5} = 1 \frac{3}{5} [/tex]

[tex] \frac{4}{9} \times \frac{15}{28} = \frac{4 \times 15}{9 \times 28} = \frac{5}{21} [/tex]
[tex]1 \frac{3}{11} \times 1 \frac{9}{35} = \frac{14}{11} \times \frac{44}{35} = \frac{14 \times 44}{11 \times 35} = \frac{8}{5} = 1 \frac{3}{5} [/tex]