2018高中数学第2章推理与证明习题课练习苏教版选修1_2.doc

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- 1 -第 2 章 推理与证明习题课课时目标 1.进一步理解直接证明和间接证明的思想.2.利用两种证明方法解决简单的实际问题1_证明和_证明是数学证明的两类基本证明方法_法和_法是直接证明中最基本的两种证明方法;_是间接证明的一种基本方法2综合法和分析法经常结合使用;直接证明比较麻烦的结论,我们可以采用_一、填空题1若实数 a, b 满足 01 成立的正整数 a 的最大值为_3 8 a3设 a, b, c 三数成等比数列,而 x, y 分别为 a, b 和 b, c 的等差中项,则 _.ax cy4 m , n (a0),则 m 与 n 的大小关系是_a a 5 a 2 a 35有下列叙述:“ ab”的反面是“ ay 或 x2 ,2 ab , a b 22 12又0b, 0.cos B0,即 B0,这与 a b c0 矛盾,故 a、 b、 c 中至少有一个大于 0.

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