若不等式
对于一切
恒成立,则a的取值范围是______ ;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05c8a36c8674f18a8fd12049777c9ca3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32a6e5b8aaed692d8be521e82df5a230.png)
更新时间:2022-10-23 14:53:51
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【知识点】 一元二次不等式在实数集上恒成立问题解读
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适中
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【推荐1】设有下列四个命题:
:若
,则
;
:“
”是“
的解集为
”的充要条件;
:
,使
成立;
:若
,则
.
则下述命题中所有真命题的序号是______ .
①
②
③
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d33da711e50e96568facb18cef27165.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bf2f454c2858e50611f8e29c7a818d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/797e67927616b141ed7c6b83f8b6f4fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52da64cce6be96893c47d6e7a89c0625.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f27fa9c0052d88485108e9505eb319c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fee50575e3ebd56c4f46dd0bbf8e55d3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c9f10038308258f981c903c54a3902.png)
则下述命题中所有真命题的序号是
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b019c1431e0b829973e32c3ebdb38f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ffe53e5b914510c277df35c08867b8a.png)
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【推荐2】若不等式
对于任意
恒成立,则实数k的取值范围为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a64f5d014eebefb1cd0064aa38eeb6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb63478132d4c1fef3c17e591919da83.png)
您最近一年使用:0次