Question

5/6 + (-5/7)= ? как решить

Answer 1

$frac{5}{6}+(- frac{5}{7})= frac{5}{6}- frac{5}{7}= frac{5*7}{6*7}- frac{5*6}{7*6}= frac{35}{42}- frac{30}{42}= frac{5}{42}$