观察下列算式,你发现了什么规律?
12=
;12+22=
;12+22+32 =
;12+22 +32 + 42 =
;…
(1)根据你发现的规律,计算下面算式的值;
________;
(2)请用一个含n的算式表示这个规律:
_________
12=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffc094721aadf0f58e067a050acff613.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1c79259c94509a5941a82e904976339.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db6a415a8008482f18e132d4a9fdfcb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ceb0d24d6d67ddd727ff6ccba0056c33.png)
(1)根据你发现的规律,计算下面算式的值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c828e8d897cfad3c582e962c5222c98.png)
(2)请用一个含n的算式表示这个规律:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19a870c41ef62202a505a9332cfe838e.png)
更新时间:2019-03-13 09:35:11
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相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】我们知道分数
写为小数形式即
,反过来,无限循环小数
写为分数形式即
.一般地,任何一个无限循环小数都可以写为分数形式.
例:将
化为分数形式.
设
,由
可知,
,所以
,解得
.于是,得![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e7e91b1d3d4f284a2fff7022e0ffbad.png)
根据以上阅读,回答下列问题:(以下计算结果都用最简分数表示)
【理解】
____________.
【迁移】将
化为分数形式,写出推导过程.(温馨提示:
,它的循环节有两位 哦!)
【创新】若
,则
__________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd7170a19afa2831ee5d9383d79cd190.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd7170a19afa2831ee5d9383d79cd190.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
例:将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d895ed3f0749d5e9f2723c35fd649e44.png)
设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a44f7a534ea008a0b9893412fb68db2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/268f990bda61b64103a3e8fcbee56e1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd480c5680216c073e00a79256c0a56e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c49ef60f0d8ec443e467c64fb0f4fa1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b00b263d960db6d4119070f804ce401d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e7e91b1d3d4f284a2fff7022e0ffbad.png)
根据以上阅读,回答下列问题:(以下计算结果都用最简分数表示)
【理解】
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd7923586e61a01eef35c7c81e78a2e.png)
【迁移】将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/778d29bbcd50b68d0681c06685ac6baa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b61754578410b49664a7985b9e7765a.png)
【创新】若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b55c2ca6e57ac7ac3fd898e7b4f08f7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8812f1b54f9574e2b487d260f8530552.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】我们用一个数对
表示从左到右排列的两个数,把
变换成
称为1次“移轴变换”.例如∶
经过1次“移轴变换”变成
,即为
,再经过1次“移轴变换”变成
.
(1)把
先经过1次“移轴变换”变成[_____,_____],再连续经过3次“移轴变换”变成[_____,_____];
(2)把
连续经过2023次“移轴变换”变成
,求
的值;
(3)若
经过1次、2次、3次、…、k次(k为正整数)“移轴变换”所得的k个数对中,左边所有数的和与x的取值无关,则k的取值可能为____.(填序号)
① 2024;②2027;③2030;④2031.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4f0cfa5839f97f252dc0126fa27bfc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4f0cfa5839f97f252dc0126fa27bfc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0d7d3cd1e5b967ee6872f731997b211.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9e7510eff1b04b2150bec32c1a5a410.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69e95cea91595736db62b0ea50388b90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/227701a253ef9f77f2eb6844dcf45b02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b7ad3858abd2c6924a4de221a4c893.png)
(1)把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eb63a30114b1266f8daadbd92b55b32.png)
(2)把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4f0cfa5839f97f252dc0126fa27bfc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1547be8db12ff3c07a6522d6a1ac4d42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87401e2d874811b4b94ac039f9681bde.png)
① 2024;②2027;③2030;④2031.
您最近一年使用:0次