刚发现前面提的一道集合题题目数据打错了.
已知集合P={X/ -2小于等于X小于等于5},集合Q={X/K+1小于等于X小于等于2K-1},且Q包含于P,求实数K的取值范围.
我算出来是-3小于等于K小于等于3.
但是标答是只有K小于等于3.
.这是为什么.
人气：410 ℃ 时间：2020-04-09 13:32:11
解答
（1）当Q不是空集时,
-2
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