Question

Сделайте по алгебре 3 и 4 пожалуйста

Answer 1

3.
$\frac{ {y}^{2} - 6y + 9 }{ {y}^{2} - 9 } \div \frac{10y - 30}{ {y}^{2} + 3y} = \\ = \frac{ {(y - 3)}^{2} }{ ({y} - 3)(y + 3)} \times \frac{ {y}(y + 3)}{10(y - 3)} = \\ = \frac{y(y - 3)^{2}(y + 3) }{ {(y - 3)}^{2} (y + 3)} = y =$
=70.

4.
$\frac{x}{y} \times \frac{y}{z} = \frac{x}{z}$
$a \times \frac{1}{a} = 1$
$\frac{x}{z} = 1$