试题与答案

已知A={x|(log2x)2-log2x＜0}，B={x|x2-2ax+a2-

来源：www.tikuol.com
题型：解答题

题目：

已知A={x|(log2x)2-log2x＜0}，B={x|x2-2ax+a2-1＞0}，且A⊆B，求实数a的取值范围．

答案：

由题意得：A={x|0＜log2x＜1}={x|1＜x＜2}．

B={x|[x-（a-1）][x-（a+1）]＞0}={x|x＞a+1或x＜a-1}，

∵A⊆B

∴2≤a-1或a+1≤1，

∴a≥3或a≤0．

考点：集合间的基本关系
试题推荐
题型：问答题

The statutory documents of a company, QU Limited, provide for two classes of shares, with each class of shareholders having the right to appoint up to two directors on the board of directors. The class A shareholders hold a majority of the issued shares and are to resolve that the rights of the class B shareholders be modified and shall only have the right to appoint one director.Required:Explain whether the holders of the class A shares can unilaterally resolve to vary the rights attached to the class B shares. (10 marks)
查看答案
微信公众账号搜索答案