数学答案
昆明一中2024届高三第7次联考数学参考答案命题、审题组教师杨昆华彭力李文清李春宣丁茵王在方张远雄李露陈泳序杨耕耘一、选择题题号12345678答案ACBCDCDB1．解析：因为，，所以，选A．2．解析：根据全称命题与存在性命题的关系，可得命题“，”的否定为：“，”，选C．3．解析：三人中恰有两人合格的概率，选B．4．解析：连接，由△为等腰三角形且为的中点，得垂直于，由知，由双曲线的定义知，在直角三角形中，，所以离心率，选C．5．解析：对于A，，设关于点的对称点为，则，因为，不共线，所以，A错误；对于B，因为，所以，当向量，是相互垂直的单位向量时，，两点间的距离为，否则距离不为，B错误；对于C...
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