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1 . 把正整数按一定的规则排成了如图所示的三角形数表(每行比上一行多一个数):设
是位于这个三角形数表中的从上往下数第
行,从左往右数第
列的数,如
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c55c73ec27729265c2dd66e6dca58e1a.png)
____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee9c913b947e10d5ad89f8940f81cc77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7600d2cfbdc6146db96cc545706004f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/065de59dbc28ef61021256e59b26fa18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c55c73ec27729265c2dd66e6dca58e1a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/62b3fd30-61bd-496d-ad54-5e35750cc907.png?resizew=94)
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2019-06-06更新
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457次组卷
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2卷引用:【市级联考】山东省潍坊市2019届高三高考模拟(5月三模)考试 数学(理)试题