计算(a^2+a+1)/(a+1)-(a^2-3a+1）/（a-3)

计算(a^2+a+1)/(a+1)-(a^2-3a+1）/（a-3)
计算(a^2+a+1)/(a+1)-(a^2-3a+1）/（a-3)

计算(a^2+a+1)/(a+1)-(a^2-3a+1）/（a-3)
0.0 应该是化简一下吧?如果a没有给出范围的话.好久没做了,有点生疏,

楼主看看,有没有算错,0.0给个采纳分哦,如果对的话