В)5/21*28/45 г)8/15*25/28 3/8*5 целых 1/3 3целых 5/9*4 целых 7/8

[latex] \frac{5}{21} * \frac{28}{45} = \frac{1}{3}* \frac{4}{9}= \frac{4}{27} [/latex] [latex] \frac{8}{15} * \frac{25}{28}= \frac{2}{3}* \frac{5}{7}= \frac{10}{21} [/latex] [latex] \frac{3}{8} *5 \frac{1}{3} = \frac{3}{8} * \frac{16}{3}= \frac{1}{1}* \frac{2}{1} =2 [/latex] [latex]3 \frac{5}{9} * 4 \frac{7}{8} = \frac{32}{9} * \frac{39}{8}= \frac{4}{3}* \frac{13}{1} = \frac{52}{3} = 17\frac{1}{3} [/latex]