(m的平方-9)分之12 -(m-3)分之2_数学解答

(m的平方-9)分之12 -(m-3)分之2

人气：264 ℃　时间：2020-03-22 14:04:38

解答

12/(m²-9)-2/(m-3)=12/(m²-9)-2(m+3)/(m²-9)
=[12-2(m+3)]/(m²-9)
=-2(m-3)/(m²-9)
=-2/(m+3)