Question

-5/13a + 1/3a =?
Помогите пожалуйсста!

Answer 1

$-\frac{5}{13} a + \frac{1}{3}a= -\frac{5a}{13} + \frac{a}{3} = \frac{3 * 5a}{3 * 13} + \frac{13a}{13 * 3} = -\frac{15a}{39} + \frac{13a}{39} = \frac{-15a + 13a}{39} = -\frac{2a}{39} a;$