2 Найдите корень уравнения: a) 13/56 + y = 34/56; в) 27/48 - a = 17/48; б) x - 7/90 = 39/90; г) b + 3/23 = 20/23.

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: y = 3/8

в) $$ \frac{27}{48} - a = \frac{17}{48} $$

$$ a = \frac{27}{48} - \frac{17}{48} $$

$$ a = \frac{27-17}{48} $$

$$ a = \frac{10}{48} = \frac{5}{24} $$

Ответ: a = 5/24

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: x = 23/45

г) $$ b + \frac{3}{23} = \frac{20}{23} $$

$$ b = \frac{20}{23} - \frac{3}{23} $$

$$ b = \frac{20-3}{23} $$

$$ b = \frac{17}{23} $$

Ответ: b = 17/23