Question

СРОЧНО ПОМОГИТЕ !!!!!!!!!!!​

Answer 1

Объяснение:

А)

$\frac{5x}{7y} \times \frac{14y}{15x} = \frac{2}{3}$

Б)

$\frac{a {}^{2} - ab}{b {}^{2} + ab } \div \frac{3a - 3b}{6(a + b)} = \frac{a(a - b)}{b(b + a)} \times \frac{6(a + b)}{3(a - b)} = \frac{6a}{3b} = \frac{2a}{b}$