Question

плиз..................

Answer 1

=

$\frac{y(y - x)}{6 {x}^{2} } \times \frac{3x}{ {(y - x)}^{2} }$

=

$\frac{y}{2x} \times \frac{1}{y - x} = \frac{y}{2x(y - x)} = \frac{y}{2xy - 2 {x}^{2} }$