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1 . 如果用反证法证明“数列{an}的各项均小于2”,有下列四种不同的假设:①数列{an}的各项均大于2;②数列{an}的各项均大于或等于2;③数列{an}中存在一项ak,ak≥2;④数列{an}中存在一项ak,ak>2;其中正确的序号为______ .(填写出所有假设正确的序号)
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2020-01-31更新
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167次组卷
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4卷引用:上海市普陀区2016届高三上学期调研(文科)数学试题
2 . 给出下列命题:
用反证法证明命题“设a,b,c为实数,且
,
,则
,
,
”时,要给出的假设是:a,b,c都不是正数;
若函数
在
处取得极大值,则
或
;
用数学归纳法证明
,在验证
成立时,不等式的左边是
;
数列
的前n项和
,则
是数列
为等比数列的充要条件;
上述命题中,所有正确命题的序号为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
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上述命题中,所有正确命题的序号为
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