2 2/5×5/6-3/4×1 2/3;1 17/28×7/9+14/25×5/7;помогите пож.

Ответ:

$2\frac{2}{5} * \frac{5}{6} -\frac{3}{4} *1\frac{2}{3} =\frac{12}{5} * \frac{5}{6} -\frac{3}{4} *\frac{5}{3} =\frac{12*5}{5*6} -\frac{3*5}{4*3} =\frac{2}{1}-\frac{5}{4} = \frac{8}{4}-\frac{5}{4} = \frac{3}{4}$

$1\frac{17}{28}*\frac{7}{9} +\frac{14}{25} * \frac{5}{7} = \frac{45*7}{28*9} +\frac{14*5}{5*7} =\frac{5}{4} + \frac{2}{1} =\frac{5}{4} +\frac{8}{4} =\frac{13}{4} =3\frac{1}{4}$

Пошаговое объяснение: