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