化简 a+3分之2+3-a分之3+a²-9分之a+15
问题描述：
化简 a+3分之2+3-a分之3+a²-9分之a+15
答
2/(a+3) +3/(3-a) +(a+15)/(a²-9)=2/(a+3)-3/(a-3)+(a+15)/[(a+3)(a-3)]=[2(a-3)-3(a+3)+(a+15)]/[(a+3)(a-3)]=(2a-6-3a-9+a+15)/[(a+3)(a-3)]=0/[(a+3)(a-3)]=0