вычислите (5/14-11/21)* 2+3

[tex] (\frac{5}{14} - \frac{11}{21} )*2+3=( \frac{15-22}{42} )*2+3=- \frac{7}{42} * \frac{2}{1}+3= 2 \frac{2}{3} [/tex]