Question

Упростите дробно рациональные выражения​

Answer 1

$3) \frac{4 - {x}^{2} }{10 - 5x} = \frac{ {2}^{2} - {x}^{2} }{10 - 5x} = \frac{(2 - x)(2 + x)}{5 \times (2 - x)} = \frac{2 + x}{5}$

$9) \frac{4 {x}^{2} - {y}^{2} }{(6x - 3y {)}^{2} } = \frac{(2x - y)(2x + y)}{(3(2x - y {))}^{2} } = \\ = \frac{(2x - y)(2x + y)}{ {3}^{2}(x - y {)}^{2} } = \frac{2x + y}{9(2x - y)}$