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(-m²/m-2+4/2-m)/(m+2)

题目详情
(-m²/m-2+4/2-m)/(m+2)
▼优质解答
答案和解析
(-m²/(m-2)+4/(2-m))/(m+2)
=(-m²/(m-2)-4/(m-2))/(m+2)
=-(m²-4)/[(m-2)(m+2)]
=-(m²-4)/(m²-4)
=-1
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