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已知全集U=R,集合A=(x|%2<x≤4),集合B=(x|x≤ 3),求...

B:{x|x5} A:{x|a-4

A 6/(x+1)-1=(6-x-1)/(x+1)>=0 (x-5)(x+1)>=0 x+1≠0 所以-1

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