Question

$\frac{y {}^{2} - 6y + 9}{y {}^{2} - 9} \div \frac{10y - 30}{y {}^{2} + 3y}$
найдите значение выражения ​

Answer 1

$\frac{y {}^{2} - 6y + 9}{y {}^{2} - 9} \div \frac{10y - 30}{y {}^{2} + 3y} = \frac{(y - 3) {}^{2} \times y(y + 3) }{(y - 3)(y + 3) \times 10(y - 3)} = \frac{y}{10}$