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Ответ:

Пошаговое объяснение:

а) 3/8 * 5/7 = [tex]\frac{3*5}{8*7}[/tex] = 15/56

б) 5/11 * 22/13 = 5/1 * 2/13 = [tex]\frac{5*2}{1*13} = \frac{10}{13}[/tex]

с) 2/25 * 15 = 2/5 * 3 = 2/5 * 3/1 = [tex]\frac{2*3}{5*1} =\frac{6}{5} =1\frac{1}{5}[/tex]

д) 1 3/7 * 4 9/10 = 10/7 * 49/10 = 1/1 * 7/1 = [tex]\frac{1*7}{1*1} =\frac{7}{1} =7[/tex]