4-4m+m²/2m-6÷(m+2)·3-m/m²-4

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4-4m+m²/2m-6÷(m+2)·3-m/m²-44-4m+m²/2m-6÷(m+2)·3-m/m²-44-4m+m²/2m-6÷(m+2)·3-

4-4m+m²/2m-6÷(m+2)·3-m/m²-4
4-4m+m²/2m-6÷(m+2)·3-m/m²-4

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)