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

問題詳情：

已知*A={x|﹣1≤x＜3}，B={x|2＜x≤5}，則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

【考點】並集及其運算．                                                                         

【專題】計算題．                                                                              

【分析】分別把兩*的解集表示在數軸上，根據數軸求出兩*的並集即可                    

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

表示在數軸上：                                                                                 

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

故選B                                                                                                

【點評】本題考查了*的基本運算，屬於基礎題．                                      

知識點：*與函數的概念

題型：選擇題