Question

помогите пожалуйста сократите дробь

Answer 1

1)(y²-144)/(12y-y²)=(y²-12²)/y(12-y)=
=(y+12)(y-12)/(-y)(y-12)=(y+12)/(-y)=-(y+12)/y , y≠0,y≠12
2)(9-6x+x²)/(x-3)=(3-x)²/(x-3)=(x-3)²/(x-3)=x-3, x≠3