4-4m+m²/2m-6÷(m+2)·3-m/m²-4

问题描述:

4-4m+m²/2m-6÷(m+2)·3-m/m²-4

原式=(m-2)²/2(m-3)×1/(m+2)×[-(m-3)/(m+2)(m-2)]
=-(m-2)/[2(m+2)²]
=(m-2)/(2m²+8m+8)