已知*A={x|﹣1≤x＜3}，B={x|2＜x≤5}，则A∪B=（　　）                 ...

问题详情：

已知*A={x|﹣1≤x＜3}，B={x|2＜x≤5}，则A∪B=（　　）                       

A．{x|2＜x＜3}            B．{x|﹣1≤x≤5}           C．{x|﹣1＜x＜5}        D．{x|﹣1＜x≤5}

【回答】

B

【考点】并集及其运算．                                                                         

【专题】计算题．                                                                              

【分析】分别把两*的解集表示在数轴上，根据数轴求出两*的并集即可                    

【解答】解：把*A={x|﹣1≤x＜3}，B={x|2＜x≤5}，                                  

表示在数轴上：                                                                                 

则A∪B=[﹣1，5]．                                                                           

故选B                                                                                                

【点评】本题考查了*的基本运算，属于基础题．                                      

知识点：*与函数的概念

题型：选择题