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时间:2019-11-17
《2019-2020年高三第二次高考模拟考试文数 含答案》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、2019-2020年高三第二次高考模拟考试文数含答案一、选择题(本大题共12小题,每小题5分,共60分,在每小题给出的四个选项中,只有一项是符合题目要求的。)二、填空题(本大题共4小题,每小题5分,共20分,将答案填在答题卡相应的位置上.)三、解答题(本大题共6小题,共70分,解答应写出文字说明,证明过程或演算步骤.)请考生在第22、23、24三题中任选一题作答,如果多做,则按所做的第一题记分.xx年哈尔滨市第三中学第二次高考模拟考试数学试卷(文史类)答案及评分标准一、选择题:题号123456789101112答案BABBBCCDCBCD二、填空题:1
2、3.14.15.16.三、解答题:17.(Ⅰ)整理得………………………………4分又得………………………………6分(Ⅱ)由(1)知……………………………8分所以……………………………………12分18.(Ⅰ)第六组···························2分第七组··························4分估计人数为··························6分(Ⅱ)设组中三人为;组中两人为则所有的可能性为,,,,,,,,,··························8分其中满足条件的为,,,··········
3、·········10分故···················12分19.(Ⅰ),分别为的中点,为矩形,·················2分,又面,面,平面⊥平面·····················4分(Ⅱ),又,又,所以面,,面··········6分三棱锥的体积=,到面的距离=···········10分可得.·············12分20.(Ⅰ)由已知得,,方程为···········3分(Ⅱ)设,则(1)当直线的斜率存在时,设方程为联立得:有①由以为直径的圆经过坐标原点O可得:·整理得:②将①式代入②式得:,··········
4、·6分又点到直线的距离··········8分所以··········10分(2)当直线的斜率不存在时,设方程为()联立椭圆方程得:代入得到即,综上:的面积是定值,又的面积,所以二者相等.·········12分21.(Ⅰ),···········1分 ···········4分(Ⅱ)由原式令,可得在上递减,在上递增∴ ·········7分即 ·································8分(Ⅲ)由(Ⅱ)知在(0,1)上单调递减∴时,即 ········
5、·························10分而时, ··················11分 ································12分22.(I)∵,∴,又∵,∴,∴∽∴又∵,∴···5分(II),,是⊙的切线,,·······10分23.(Ⅰ)圆的极坐标方程为:·········5分(Ⅱ)圆心到直线距离为,圆半径为,所以弦长为···········10分24.(Ⅰ)的解集为:··········5分(Ⅱ)··········10分
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