(a-b分之a-c)-(b-a分之c-b)
=(a-c)/(a-b)+(c-b)/(a-b)
=(a-c+c-b)/(a-b)
=(a-b)/(a-b)
=1
如果本题有什么不明白可以追问,如果满意请点击“选为满意答案”