X+1分之2和X+3分之3需要通分,得多少.
问题描述：
X+1分之2和X+3分之3需要通分,得多少.
答
2/(x+1)+3/(x+3) =[2(x+3)+3(x+1)]/[(x+1)(x+3)] =(5x+9)/[(x+1)(x+3)]
X+1分之2和X+3分之3需要通分,得多少.
2/(x+1)+3/(x+3) =[2(x+3)+3(x+1)]/[(x+1)(x+3)] =(5x+9)/[(x+1)(x+3)]