黑龙江2023~2024学年度高一上学期期末联考(24034A)数学.考卷答案

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黑龙江2023~2024学年度高一上学期期末联考(24034A)数学.考卷答案试卷答案

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分析(1)先化简A,B,再求A∪B;
(2)若A∩B=B,则B⊆A,分类讨论,求实数a的取值范围.

解答解:(1)由$\left\{\begin{array}{l}{x>0}\\{3-x>0}\end{array}\right.$,可得0<x<3,∴A=(0,3),
a=2,B=[1,2],
∴A∪B=(0,3);
(2)若A∩B=B,则B⊆A.
a<1,B=(a,1),∵B⊆A,∴a>0,∴0<a<1;
a=1,B={1},满足B⊆A;
a>1,B=(1,a),∵B⊆A,∴a<3,∴1<a<3;
综上,实数a的取值范围是0<a<3.

点评本题考查集合的运算与关系,考查分类讨论的数学思想,属于中档题.