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2018年高中数学第1章常用逻辑用语1.2简单的逻辑连接词课件3苏教版选修2_1.ppt

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课本例4,课堂练习2,课堂练习3,命题的否定,1,1,逻辑联结词,“或” “且” “非”,三、逻辑联结词,课堂练习,点评,点评,点评否定词语,(1) a0 或 b0. (2) 实数a、b、c都大于零. (3)方程至多两个解. 解: (1)a0且 b0.(2)实数a、b、c不都大于零.(3)方程至少三个解.,对一些词语的否定,

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