设A={x|-2≤x≤5},B={x|m-1≤x≤2m+1}, (1)当x∈N*时,求A的真子

 A{x|2≤x≤5}B{x|m1≤x≤2m1}

(1)xN*时,求A的真子集的个数;

(2)xRA∩BØ时,求m的取值范围.

答案

解:(1) 31(2)A∩BØm1>2m12m1<2m1>5m<3/2m>6.   

相关题目

Though _______ focus from work to family, the 34-year-old actress refuses to be
Though _______ focus from work to family, the 34-year-old actress refuses to be a full-time housewife. A. having shifted       B. to have shifted C. shifted              D. being shif
If I _______ you, I ________ on holiday for a rest. A. were; would go   B. was
If I _______ you, I ________ on holiday for a rest. A. were; would go   B. was; would go   C. were; will go   D. was; will go  
如图为一直角三角形纸片,∠C=90°,两直角边AC=6㎝,BC=8㎝,
如图为一直角三角形纸片,∠C=90°,两直角边AC=6㎝,BC=8㎝,现将直角边AC沿直线AD折叠,使它落在斜边AB上,且与AE重合,求CD的长 
The bus rolled into the valley, _______ over 20 deaths. A. caused       B.
The bus rolled into the valley, _______ over 20 deaths. A. caused       B. having caused        C. causing    D. to cause  
The bad weather _____ our difficulties. A. added to B. was added to   C. adde
The bad weather _____ our difficulties. A. added to B. was added to   C. added up D. added up to
 “对美国政府有利的事就是对通用公司有利”是流行于20世
 “对美国政府有利的事就是对通用公司有利”是流行于20世纪50年代美国的谚语。这则谚语揭示了(   ) A.大企业与国家政权关系密切 B.全球化是
有人提出,在新经济时代,市场竞争的结果,将更多的体现
有人提出,在新经济时代,市场竞争的结果,将更多的体现为“快鱼吃慢鱼”,而不是“大鱼吃小鱼”。这一观点主要是为了说明,企业必须       
1.下列各句中加横线成语的使用,全部正确的一项是 ①欧洲
1.下列各句中加横线成语的使用,全部正确的一项是 ①欧洲杯决赛场上,随着葡萄牙前锋埃德尔在加时赛第109分钟的一脚劲射破门。整个球场顿时沸腾

最新题目