Simplify the following expressions: 6. 5/9 * a + 4/9 * a

Решение:

1. \[ \frac{5}{9} a + \frac{4}{9} a = \left( \frac{5}{9} + \frac{4}{9} \right) a = \frac{5+4}{9} a = \frac{9}{9} a = 1a = a \]

Ответ: a