1 . (1)已知
是实数,集合
,
.求证:“
”是“
”的充要条件.
(2)设
.用反证法证明命题“若
,则
或
.”
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8cc9571341dca622ca7b495f56af2cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49463959d426a3ad6931eb232e5e5e4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0086b054ef120408acac806a1b1318.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6606a5ae253107b4c200af0df215f64.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dcbca3478eae63853d2aab5332e2e56.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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2020-11-13更新
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3卷引用:上海市崇明区2020-2021学年高一上学期期中数学试题