1.选择题- (共4题)
3.某数学教师对所任教的两个班级各抽取20名学生进行测试,分数分布如表:
分数区间 | 甲班频率 | 乙班频率 |
[0,30) | 0.1 | 0.2 |
[30,60) | 0.2 | 0.2 |
[60,90) | 0.3 | 0.3 |
[90,120) | 0.2 | 0.2 |
[120,150) | 0.2 | 0.1 |
(Ⅰ)若成绩120分以上(含120分)为优秀,求从乙班参加测试的90分以上(含90分)的同学中,随机任取2名同学,恰有1人为优秀的概率;
(Ⅱ)根据以上数据完成下面的2×2列联表:在犯错概率小于0.1的前提下,你是否有足够的把握认为学生的数学成绩是否优秀与班级有关系?
优秀 | 不优秀 | 总计 | |
甲班 | |||
乙班 | |||
总计 |
k0 | 2.072 | 2.706 | 3.841 | 5.024 | 6.635 | 7.879 | 10.828 |
P(K2≥k0) | 0.15 | 0.10 | 0.05 | 0.025 | 0.010 | 0.005 | 0.001 |
,其中n=a+b+c+d.
4.△ABC的内角A,B,C的对边分别为a,b,c,已知2cosC(acosB+bcosA)=c.
(Ⅰ)求C;
(Ⅱ)若c= {#mathml#}{#/mathml#} ,△ABC的面积为 {#mathml#}{#/mathml#} ,求△ABC的周长.
2.单项选择- (共5题)
5.
As ________ mountains surrounding our village are turning much greener, they have become ________ home to a large number of wild animals.
A.the; / | B.the; a | C./; a | D.the; the |
6.
______in her best suit , the girl tried to make herself _____at the party.
A.Dressed ; noticed | B.Dressing ; noticing |
C.Dressed ; noticing | D.Dressing ; noticed |
7.
He could have finished it on schedule, but ________ he fell behind.
A.somehow | B.anyway | C.somewhat | D.anyhow |
8.
In the exam , the__________ you are, the__________ mistakes you’ll make.
A.carefully; little | B.more carefully, fewer |
C.more careful; fewer | D.more careful; less |
试卷分析
-
【1】题量占比
选择题:(4道)
单项选择:(5道)
-
【2】:难度分析
1星难题:0
2星难题:0
3星难题:0
4星难题:0
5星难题:0
6星难题:5
7星难题:0
8星难题:0
9星难题:0