Question

помогите плиззззз даю 10 балов

Answer 1

$\frac{a + 5b}{a {}^{2} + 10ab + {25b}^{2} } = \frac{a + 5b}{(a + 5b) {}^{2} } = \frac{1}{a + 5b} = \frac{1}{10 + 5 \times 3} = \frac{1}{25}$