2 Найдите корень уравнения: a) \(\frac{13}{56}\) + y = \(\frac{34}{56}\); б) x - \(\frac{7}{90}\) = \(\frac{39}{90}\);

a) \(\frac{13}{56}\) + y = \(\frac{34}{56}\)

y = \(\frac{34}{56}\) - \(\frac{13}{56}\)

y = \(\frac{34-13}{56}\)

y = \(\frac{21}{56}\) = \(\frac{3}{8}\)

Ответ: \(\frac{3}{8}\)

б) x - \(\frac{7}{90}\) = \(\frac{39}{90}\)

x = \(\frac{39}{90}\) + \(\frac{7}{90}\)

x = \(\frac{39+7}{90}\)

x = \(\frac{46}{90}\) = \(\frac{23}{45}\)

Ответ: \(\frac{23}{45}\)