化简 a+3分之2+3-a分之3+a²-9分之a+15_数学解答

化简 a+3分之2+3-a分之3+a²-9分之a+15

人气：419 ℃　时间：2020-02-01 07:32:35

解答

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