Question

Выполните вычитание:

Answer 1

Ответ:

$\frac{18}{a {}^{2} + 3a } - \frac{6}{a} = \frac{18}{a(a + 3)} - \frac{6}{a} = \frac{18 - 6(a + 3)}{a(a + 3)} = \frac{18 - 6a - 18}{a(a + 3)} = \frac{ - 6a}{a(a + 3)} = - \frac{ 6}{a + 3}$