2m-4分之3-m\(m+2- m-2分之5)

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=(3-m)/察伏2(m-2) ÷[(m+2)(m-2)-5]/(m-2)
=(3-m)/2(m-2)÷(m²-9)/(m-2)
=(3-m)/2(m-2)× (m-2)/升丛(m+3)(m-3)
=-1/败笑携(m+3)

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