观察下面三行数
1,-2,4,-8,16,-32 …… ①
0,-6,6,-18,30,-66 …… ②
2,-4,8,-16,32,-64 …… ③
(1)第③行的数按什么规律排列?
(2)第①、②行的数与第③行的数分别有什么关系?
(3)取每行数的第8个数,计算它们的和.
1,-2,4,-8,16,-32 …… ①
0,-6,6,-18,30,-66 …… ②
2,-4,8,-16,32,-64 …… ③
(1)第③行的数按什么规律排列?
(2)第①、②行的数与第③行的数分别有什么关系?
(3)取每行数的第8个数,计算它们的和.
11-12七年级上·重庆·期中 查看更多[1]
(已下线)2010-2011学年岩口复兴学校七年级第一学期期中考试数学卷
更新时间:2016-12-05 07:41:23
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【知识点】 用代数式表示数、图形的规律解读
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解答题-问答题
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【推荐1】阅读材料:
分析探索题:细心观察如图,认真分析各式,然后解答问题.
,
;
,
;
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e215934609c9cd4af5d0afde47e7f55e.png)
请用含有
为正整数
的等式
______;
推算出
______;
求出
的值.
分析探索题:细心观察如图,认真分析各式,然后解答问题.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/094fd790b2f1449e3c32088078429802.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f975d2d46c694be2bec8a8ee73af1903.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9e59dd960e6daa03d033829c4a51b48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc2b167a9f03c077e788e295cc87e4ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f26bbcae06a93e24b20b1e1d09fdc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e215934609c9cd4af5d0afde47e7f55e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d05c50ea5f6068e3ebc11ec59723d083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6182d754e589b07ffc5074b97e8ae5a2.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd171b163d5191b9cb6ee93e8549facd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e899f9f1e24215866a917fedc0dfb95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c51c6554112f1f594d4615b892fd135f.png)
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解答题-计算题
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【推荐2】阅读下面材料并完成填空,你能比较两个数
和
的大小吗?为了解决这个问题,先把问题一般化,即比较
和
的大小(
,且
为整数).然后,从分析这些简单情形入手,从中发现规律,经过归纳,猜想出结论.
(1)通过计算,比较下列各组两个数的大小(在横线上填“
”“
”或“
”).
①
________
;②
________
;
③
________
;④
________
;
⑤
________
;⑥
________
.
(2)对第(1)小题的结果进行归纳,可以猜想出
和
的大小关系.
(3)根据上面归纳猜想得到的一般结论,可以得到
________
(填“
”“
”或“
”)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f2abb999bee661ea9205f53929dba24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ed533703d6b7356347117baac0f128e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9414e4fcde0d04825243b89fd9435e26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b30e385817e1dd54569bd2a49e9c38f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e167b43045b3297248e334c41c621b8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(1)通过计算,比较下列各组两个数的大小(在横线上填“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392cdb9d30684cce244bef94b8d861b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7942da6c3fc4005256fb1458557c0.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a59a2436c32f2de1b93c7f1f8b7371f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78697a69758b8d469a74236859514a72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6648bc986a558fa32e752d28d3a68431.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb3f00a02e931a265f86950296602f0f.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f31f4bb041929b56b13ca6df65496228.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69b630bc20f1ca5fd0621ca3d4b1dbf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c61e8f668182ec53d065909dcf4b2140.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b20c44627dd83e482c0029c5fc282991.png)
⑤
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a0f712d54db8c891f0f1de008e049a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26be7c3f0c0462341f9b26e44cc06f3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35648206c923c6330ac9b7973041488c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/804ab9adb0c795ddc8f846c64edf9508.png)
(2)对第(1)小题的结果进行归纳,可以猜想出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9414e4fcde0d04825243b89fd9435e26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b30e385817e1dd54569bd2a49e9c38f.png)
(3)根据上面归纳猜想得到的一般结论,可以得到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f2abb999bee661ea9205f53929dba24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ed533703d6b7356347117baac0f128e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7942da6c3fc4005256fb1458557c0.png)
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