已知M={x2,2x-1,-x-1},N={x2+1,-3,x+1},且M∩N={0,-3},则x的值为()A.-1B.1C.-2D.2-数学

题目简介

已知M={x2,2x-1,-x-1},N={x2+1,-3,x+1},且M∩N={0,-3},则x的值为()A.-1B.1C.-2D.2-数学

题目详情

已知M={x2,2x-1,-x-1},N={x2+1,-3,x+1},且M∩N={0,-3},则x的值为(  )
A.-1B.1C.-2D.2
题型:单选题难度:偏易来源:不详

答案

∵M∩N={0,-3},
∴0∈N
∵x2+1≥1
∴x+1=0解得x=-1
当x=-1时,M={1,-3,0}  N={2,-3,0}满足题意
故选A

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