古希腊数学家把1、3、6、10、15、21、…叫做三角形数,其中1是第一个三角形数,3是第二个三角形数,6是第三个三角形数,…,依此类推,第100个三角形数是______ .
2017高三·全国·专题练习 查看更多[1]
(已下线)《2017届优生百日闯关系列》【专题一】第二关 以数字及图形规律探究问题为背景的选择填空题
更新时间:2018-04-21 23:36:14
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填空题-单空题
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适中
(0.65)
【推荐1】已知数列:
,
,
,
,
,
,
,
,
,…根据它的前9项的规律,这个数列的第30项为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed3b68a28b6edbaa111066b3f7867aae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4f438a2955e3e87522bd3719a42f33d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8f5eb811d30b64f83d77668f5aeb644.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/425e1b4b3e897ab0997388b73c2cf1fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
您最近一年使用:0次
填空题-单空题
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适中
(0.65)
【推荐2】观察下列等式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fab08d6ebebbb852cfcba36090c3200a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df71e9edb5c1e8aa5dea674f0a9baee6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2875aadace981a9878e8068694692903.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/586a3e4bab84ba346fe35ba0157368ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d93facc155687da33fc435e5c0f74b5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07096af3b99fd1cb11c31f19a2c6408e.png)
可以推测:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6925cd932decea8ff10fc2a68d6a5d7f.png)
__________ .(
,用含有
的代数式表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/876d453473dd136199f4fd4653f00a47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fab08d6ebebbb852cfcba36090c3200a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdc114012e9d5888ca8ac6b6eacd306e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df71e9edb5c1e8aa5dea674f0a9baee6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2951339fceee7a7749d4adb55befcda2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2875aadace981a9878e8068694692903.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/709e680f5cd49e7a0b6f8c536f96163a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/586a3e4bab84ba346fe35ba0157368ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa1681b59ed9ea2a77465e64bdedc39c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d93facc155687da33fc435e5c0f74b5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07096af3b99fd1cb11c31f19a2c6408e.png)
可以推测:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6925cd932decea8ff10fc2a68d6a5d7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b98ef143f8159f3a7dafa1fd2f2370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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