已知
和
的等差中项是
,则实数
的值是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5631bc01b998a4b3fabd9e131699dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
更新时间:2023-02-07 20:18:37
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【知识点】 等差中项的应用
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【推荐2】已知
,
,
成等差数列,则①ac≥b2;②b2≥ac;③
中,正确的是______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ad1a361a983bfef8d7d8bf6ae2db90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f13cae11ae57d66e861d65289c931c2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a97c8bb0c3f1f204ed5b0b96ee47ee6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9bbe949ed437e6e3d365cc61a0235b1.png)
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