集合A={x|-1≤x0},满足B∪C=C.求实数a的取值范围
人气:280 ℃ 时间:2019-08-20 12:07:22
解答
(1)解B,得,x≥2,所以 A∩B={x|2≤x-2x,若使x≥2在C内恒成立,则须使,
x=2或x>2时a>-2x恒成立,
而在x=2时取到极值,
所以a>-4.
推荐
- 已知集合A={x|-1≤x0},满足B∪C=C,求实数a的取值范围
- B={2x-4≧x-2},若集合{x|2x+a>0},满足B∪C=C,求实数a的取值范围.
- 设非空集合A={x|-2≤x≤a},B={y|y=2x+3,x∈A},C={z|z=x2,x∈A},且B∩C=C,求实数a的取值范围
- 已知集合A={x|-2≤x≤a},B={y|y=2x+3,x∈A},C={z|z=x×x,x∈A},若集合C属于集合B,求实数a的取值范围
- 设非空集合A={X/-2≤x≤a},B={y/y=2x+3,x∈A},C={Z/Z=X^2,x∈A},且C包含于B,求实数a的取值范围
- Teaching high school students in a poor mountain village may not sound like fun to you,求句子成分
- —There is a knock at the door.—---------------?A.who is that?B.who can it be?...
- 一颦一笑一回眸 半梦半真半苍茫什么意思
猜你喜欢