名校
1 . ①在
中,若
,
,
,则此三角形的解的情况是两解.
②数列
满足
,
,则
.
③在
中,
为中线
上的一个动点,若
,则
的最小值是
.
④已知
,则
.
⑤已知等比数列
的前
项和为
,则
,
,
成等比数列.
以上命题正确的有______ (只填序号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a110bb6e761a161260c92dea2121d2db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f48934086667319958726544e37f649.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e54a36173cd9b7b28e91619d715cb569.png)
②数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab9f5746a7728ce4aa2557d1269ffb37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eeaa7871bcc1c45c752895d535e907ce.png)
③在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/810fee760e06028fb7d37e65db79bfa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4f0d68fb700d93bb711ab383bc0df71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
④已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/886f3c1fc76321833d2a8dd8f1a0b707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98b27502c1bb8e01c37fa5a72853814c.png)
⑤已知等比数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5188d6760683a860adab0cda195cdf80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cd6fe11dfa538e67bfd63478fc428a1.png)
以上命题正确的有
您最近一年使用:0次
名校
2 . 已知等比数列
的前
项和为
,且函数
,若方程
至少有三个实数根,则实数
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e710f05a289fd39afaffd0a0038d8907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/569fc6e1c12b270e4f7f5f144d30e0ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5cbad35ab4c6bd1c9a1d2d99be65181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次