Question

СРОЧНО ПЖ ОСТАЛОСЬ 3 МИНУТЫ​

Answer 1

а) $\frac{2}{7} +\frac{1}{3} -\frac{1}{4}=\frac{24+28-21}{84} =\frac{31}{84}$

б) $\frac{5}{8} -(\frac{1}{4} +\frac{1}{3}) = \frac{5}{8} -(\frac{3}{12} +\frac{4}{12} )=\frac{5}{8} -\frac{7}{12} =\frac{15-14}{24} =\frac{1}{24}$