一个类似杨辉三角形的数阵:则第九行的第二个数为__________ .
![](https://img.xkw.com/dksih/QBM/2018/3/14/1902059772600320/1902839877165056/STEM/e376d777efad4243b1e94edd323e09d2.png?resizew=173)
2015·陕西·一模 查看更多[4]
2015届陕西省西工大附中高三下学期模拟考试一理科数学试卷陕西省西安市第一中学2018届高三上期中数学(理)试题人教A版(2019) 选择性必修第二册 过关斩将 第四章 数列 4.4 数学归纳法(已下线)专题10 推理与证明-【备战高考】2021年高三数学高考复习刷题宝典(填空题专练)
更新时间:2016-12-03 14:57:18
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填空题-单空题
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适中
(0.65)
解题方法
【推荐1】记
,当
、
、
、
时,观察下列等式:
,
,
,
,
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dab783880d7aabc422916886630fc576.png)
可以推测,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65b56181fd53e8bb9b94853b0d71ad40.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f83a26d7d1b83642b4d1410eaf69af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5095a28bb1b91bf6bed9e2cfbd76bb18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbf4544e56821f1bdc4c67a4065083e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a0ec0971ffc6ed6ca475d24763089c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1463ee2a441bfeb8b0f272c3ae898bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ca6753e497f2b9cbe70d3bb594caa53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af7db628d0fef568c7dcc8464a8be015.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dab783880d7aabc422916886630fc576.png)
可以推测,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65b56181fd53e8bb9b94853b0d71ad40.png)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
【推荐2】观察下面的三角形数组,可以推测:该数组第10行的和为______ .
![](https://img.xkw.com/dksih/QBM/2020/7/22/2511301012529152/2512129217126401/STEM/bcaa8050-cf8c-43f8-8994-3e0d0a782257.png)
您最近一年使用:0次