=) сократите дробь: 1)х3+4х2-9х-36/(х-3)(х+4) 2)х3+2х2-9х-18/(х-3)(х+2) 3)х3-5х2-9х+45/(х-5)(х+3)

1) (Х2(2+4)-9(Х+4))/(Х-3)(Х+4)=((Х+4)(Х2-9))/(Х-3)(Х+4)=(Х+4)(Х-3)(Х+3)/(Х-3)(Х+4)=Х+3

2) (Х2(Х+2)-9(Х+2)/(Х-3)(Х+2)=(Х2-9)(Х+2)/(Х+2)(Х-3)=(Х-3)(Х+3)(х+2)/(Х+2)(Х-3)=Х+3

3)Х2(Х-5)-9(Х-5)/(Х+3)(Х-5)=(Х2-9)(Х-5)/(Х+3)(Х-5)=(Х-3)(Х+3)/(Х+3)=Х-3