计算:m-3分之2减去3-m分之1-m

题目

计算:m-3分之2减去3-m分之1-m

答案

透明的鱼吹泡泡：
2/(m-3)-(1-m)/(3-m)
=2/(m-3)+(1-m)/(m-3)
=(2+1-m)/(m-3)
=(3-m)/(m-3)
=-1