2 1/3•6/7-2 1/4:5 3/4

По действиям: [latex]2 \frac{1}{3} * \frac{6}{7}=\frac{3*2+1}{3} * \frac{6}{7} =\frac{7}{3} * \frac{6}{7} =\frac{7:7}{3:3} * \frac{6:3}{7:7} =\frac{1}{1} * \frac{2}{1} =2[/latex] [latex]2 \frac{1}{4} :5 \frac{3}{4} = \frac{9}{4} : \frac{23}{4} =\frac{9}{4} * \frac{4}{23} = \frac{9}{23} [/latex] [latex]2 - \frac{9}{23} =1 \frac{23}{23} - \frac{9}{23} =1 \frac{23-9}{23} =1 \frac{14}{23} [/latex]