解题方法
1 . 已知正方体
的顶点A处有一只小蜜蜂,小蜜蜂每次会随机地沿一条棱向相邻的某个顶点移动,且向每个顶点移动的概率相同,求小蜜蜂移动2次后仍在底面
的概率![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c3eaee0866bc35ffa5a39a989d2dfa7.png)
_________ ;小蜜蜂移动n次后仍在底面
上的概率![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0ba5711dfbd33e558e0cebf8e1158b9.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fab973d4487601909148ef64edd75d0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c3eaee0866bc35ffa5a39a989d2dfa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0ba5711dfbd33e558e0cebf8e1158b9.png)
您最近一年使用:0次
解题方法
2 . 已知数列
的前n项和为
,
,若存在两项
,
,使得
,则下列结论正确的是___________ .(填写所有正确的序号)
①数列
为等差数列;
②数列
为等比数列;
③
为定值;
④设数列
的前n项和为
,
,则数列
为等差数列.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60965815aa04043db051b7bd89eda80d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/681ae1522a36768618f7ddaf74abbb7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/300e2a4fd67460b554c5a1b6250b463f.png)
①数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
②数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fd1f0ace9ca0b79929e73af6c201c2e.png)
④设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/322a562f21a7104a2a1e238bc2ddbe79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5603dc343728b22e51232c29f3f3078b.png)
您最近一年使用:0次
2022-01-15更新
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571次组卷
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