(通用版)2020版高考数学大一轮复习第3讲简单的逻辑联结词、全称量词与存在量词课件文新人教A版.pptx

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课前双基巩固课堂考点探究教师备用例题,1.了解逻辑联结词“或”“且”“非”的含义. 2.理解全称量词和存在量词的意义. 3.能正确地对含有一个量词的命题进行否定.,考试说明,记忆口诀:“p或q”,有真则真;“p且q”,有假则假;“非p”,真假相反.,知识聚焦,“且”“或”“非”,假,真,真,假,假,真,真,假,真,真,假,假,全称量词,存在量词,x0M,p(x0),xM,q(x),对点演练,题组一 常识题,题组二 常错题,索引:全称命题或特称命题的否定出错;不会利用真值表判断命题的真假致错;复合命题的否定中出现逻辑联结词错误;判断命题真假时忽视对参数的讨论致错.,探究点一 含逻辑联结词的命题及其真假,总结反思 判断含有逻辑联结词的命题真假的一般步骤: (1)判断复合命题的结构; (2)判断构成复合命题的每个简单命题的真假; (3)依据“或”(一真即真),“且”(一假即假),“非”(真假相反)作出判断即可.,探究点二 全称命题与特称命题,探究点三 根据命题的真假求参数的取值范围,【备选理由】 这里所选的例题都是对前面例题的补充,意在加深学生对逻辑联结词、全称命题和特称命题等概念的理解和运用,培养学生快速解题的能力.,

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