Выполните дейстивея а)7/8*1 5/7 б)6/7*2 11/12

а) [latex] \frac{7}{8} * 1 \frac{5}{7} = \frac{7}{8} * \frac{12}{7} = \frac{84}{56} [/latex] Сократим на 4 [latex] \frac{84}{56} = \frac{21}{14} =1 \frac{7}{14} [/latex] б) [latex] \frac{6}{7} * 2 \frac{11}{12} = \frac{6}{7} * \frac{35}{12} = \frac{210}{84} = 2 \frac{42}{84} [/latex]