3-m/2m-4÷(m+2-[(5/m-2)]=

分类: 作业答案 • 2021-12-29 15:00:37

问题描述：

答

原式=-(m-3)/2(m-2)÷[(m+2)(m-2)-5]/(m-2)
=-(m-3)/2(m-2)÷(m²-9)/(m-2)
=-(m-3)/2(m-2)×(m-2)/(m+3)(m-3)
=-1/2(m+3)
=-1/(2m+6)