Question

15а-3в/3а+5в а=2;в=3

Answer 1

Ответ:

$\frac{15a - 3b}{3a + 5b} = \frac{3(5a - b)}{3a + 5b} = \frac{3(5 \times 2 - 3)}{3 \times 2 + 5 \times 3} = \frac{3(10 - 3)}{6 + 15} = \frac{3 \times 7}{21} = \frac{21}{21} = 1$