Question

1. выполните вычитание дробей: 2) 3/3-y - y/y^2-9

Answer 1

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

Answer 2

(9+4y)/(9-y²)

Объяснение:

(-3(у+3)/y²-9)-(y/y²-9)=(-3y-9-y)/y²-9=(-4y-9)/y²-9=(9+4y)/(9-y²)