Question

ПОМОГИТЕ ПОЖАЛУЙСТА!!!!!​

Answer 1

Ответ:

$\displaystyle \frac{2}{5}+\frac{3}{5}=\frac{2+3}{5}=\frac{5}{5}=1\\\\\\\frac{6}{23}-\frac{2}{23}=\frac{6-2}{23}=\frac{4}{23}\\\\\\\frac{2}{15}^{|4}+\frac{7}{12}^{|5}=\frac{2\cdot 4+7\cdot 5}{60}=\frac{8+35}{60}=\frac{43}{60}\\\\\\\frac{25}{28}^{|3}-\frac{2}{21}^{|4}=\frac{25\cdot 3+2\cdot 4}{84}=\frac{75+8}{84}=\frac{83}{84}$