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1 . 用反证法证明命题:“已知
,则
且
”时,应假设______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dccf7fdc9ff5e9e6ed897ec3a716a35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88a6bea084567e3055f0e58499398a46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b897700904b00cb79a5a75b82eb3eaf.png)
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2 . 若要用反证法证明“三角形的内角中最多有一个钝角”,需要假设“三角形的内角中_________ .
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3 . 设
、
. “若
,则
或
”是一个真命题.用反证法证明这个命题是真命题时,可以先假设该命题的结论不成立,即:_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95cccdff49c3efe6e7a7dbbf69db9319.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f9e131cdd242d56b6dba05ab3363ef3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eec336faee8689281a6f6b465e7fcff9.png)
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4 . 命题“
,若
,则
或
”用反证法证明时应假设为____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73254f32b6da29ecc32df2e9f87a4c97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f71a7888032847705f122e3ed0743ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3c442579603164f3fc19458677d307.png)
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5 . 用反证法证明命题“
或
”时要做的假设是______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eec336faee8689281a6f6b465e7fcff9.png)
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6 . 用反证法证明:“若
,则
或
”时,应假设____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3898b62d3fbcb61afb6bc1e9b910f564.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef00713e73b8357cc7900144f5505bc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23d29646155e27b172ecdf263e2d702.png)
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7 . 用反证法证明命题:若实数a、b、c满足
,且
,则
且
.正确的假设是:__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e56f4504e0f80fd031c8b5f41832e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce613eaa5df46a50174085ef5d1087fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f75807858b7804a1ad2039c41f323a18.png)
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8 . 用反证法证明命题“若
,则
或
”的过程中,应当作出的假设是______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f9e131cdd242d56b6dba05ab3363ef3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eec336faee8689281a6f6b465e7fcff9.png)
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9 . 用反证法证明命题“
或
”时要做的假设是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bad3681a81aad62ffae694754859be41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff8411e793b5bb96a07e529a4883273.png)
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10 . 用反证法证明命题“对任意
,都有
时,应首先“假设___________ ”,再推出矛盾,从而说明假设不能成立,原命题为真命题.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a37a59558292ad6b3d0978bfd7484990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/397220a2025730da198a1ee02fef1b76.png)
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