Алгебра. Помогите пожалуйста!
1 1)a/(a-3)-(a-3)/(a+3)=(a²+3a-a²+6a-9)/(a²-9)=(9a-9)/(a²-1) 2)(a+3)/(1-a)*9(a-1)/(a-3)(a+3)=-9/(a-3)=9/(3-a) 2 1)(b+1)/(b-1)-b/(b+1)=(b²+2b+1-b²+b)/(b²-1)=(3b+1)/(b²-1) 2)(3b+1)/(b-1)(b+1)*2(b-1)/(3b+1)=2/(b+1)