设A={x|x2-2x-3>0},B={x|x2+ax+b≤0}.若A∪B=R.A∩B=(3.4].则a+b等于( ) A.7 B.-1 C.1 D.-7 查看更多

 

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A={x|x2-2x-3>0},B={x|x2+ax+b≤0},若AB=R,AB=(3,4],则a+b等于

A.7                                                                 B.-1

C.1                                                                 D.-7

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A={x|x2-2x-3>0},B={x|x2+ax+b≤0},若AB=R,AB=(3,4],则a+b等于
A.7B.-1
C.1D.-7

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A={x|x2-2x-3>0},B={x|x2+axb≤0},若 AB=R,AB=(3,4],则a b等于 (  )
A.7B.-1C.1D.-7

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