Помогите с алгеброй плиз

1 1)(y+3)/(y-3)-y²/(y-3)(y+3)=(y²+6y+9-y²)/(y-3)(y+3)=(6y+9)/(y-3)(y+3)= =3(2y+3)/(y-3)(y+3) 2)(y+3)/(2y+3)*3(2y+3)/(y-3)(y+3)=2/(y-3) 2 4a^4b³ * (a+b)³/8a^9=b³(a+b)³/2a^5