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2018年高中数学第二章推理与证明2.2.2反证法课件7新人教B版选修2_2.ppt

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,推理与证明,推理,证明,合情推理,演绎推理,直接证明,间接证明,类比推理,归纳推理,分析法,综合法,反证法,证明 是无理数.,证明：假设 是有理数,则存在互质的正整数m、n使得,反证法证明数学问题的一般步骤：,1.假设命题的结论不成立；,3.由矛盾结果，断定假设不成立，从而肯定原结论成立。,2.由假设出发，经过一系列正确的推理得出矛盾；,类型一：,类型二：,类型三：,

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