如图,为了提高业主的宜居环境,在某居民区的建设中,因地制宜规划修建一个草坪(阴影部分).
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/27/a4f9e7f9-d8f3-4a75-afc3-4dc27459b76f.png?resizew=170)
(1)用字母表示草坪的面积;
(2)若
,
,求草坪的面积.(
取3)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/27/a4f9e7f9-d8f3-4a75-afc3-4dc27459b76f.png?resizew=170)
(1)用字母表示草坪的面积;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa4c355f11471a38f5583a434a1ddeb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ab1c19b66cda3fb899f06d9a25e973c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f5389990c3a0c5373f3bd9fb2454c9.png)
更新时间:2024-01-27 11:26:32
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【推荐1】定义∶对于一个两位数
,如果
满足个位数字与十位数字互不相同,且都不为零,那么称这个两位数为“相异数”,将一个“相异数”的个位数字与十位数字对调后得到一个新的两位数,将这个新两位数和原两位数的和除以
得到的商记为
.例如∶
,对调个位数字与十位数字得到的新两位数为
,新两位数与原两位数的和为
,
除以11的商为
,所以
.
(1)下列两位数∶
,
,
中,“相异数”为______,计算∶
______;
(2)若一个“相异数”
的十位数字是
,个位数字是
,且
,求“相异数”
的值;
(3)小美同学发现∶若
,则“相异数”x的个位数字与十位数字之和一定为
,请判断小美同学的发现是否正确.如果正确,请说明理由;如果不正确,请举出反例.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d0b71b8d2c183154221f717ce09077b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3888740fa8b552b55b4a0c8ae4166007.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c78daf39ea522a6b4584ca2b699ba720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/814397354c2ae1cb08e0271305970811.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc228f5ffd23ca544083fe5c7bdd5de4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92128c6c226ce688bc160fb86854f2fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90fc7ed1ea9a0656c5ec712b4d1f3e4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ae4ec6a327a51b32a33fa64c76ea4e0.png)
(1)下列两位数∶
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c2f0486c5492c0a71c2e63edcb60033.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ef0a9f421547e737ec464d29b314403.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e653f9b4678cb7edb2a67bd40624040d.png)
(2)若一个“相异数”
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0b26b2c701580aa8cc7aaf3e414692e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5113d95632f02b4c4794cde885054556.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(3)小美同学发现∶若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d29ba0e24bf4a3e4b19f7120aafc3db5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
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【推荐2】某建筑物的窗户如图所示,它的上部是由4个扇形组成的半圆形,下部是由边长都为
的4个小正方形组成的正方形,用含
的代数式表示制造窗框的材料总长(即图中所有黑线的长度和).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐1】已知
分别表示
的整数部分和小数部分,a是m2+n2的小数部分,求a的值.
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解答题-计算题
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【推荐2】如图1,将长为
,宽为
的长方形分割成四个全等的直角三角形,拼成如图2,得到大小两个正方形.
(1)用含
的代数式表示图2中小正方形(阴影部分)的边长;
(2)用含
的代数式表示图2中大正方形的面积;
(3)当
时,分别计算大正方形和小正方形的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23e6a140548010f388a3c1b315501ca7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d2a7b13d95229e2e938514739054541.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/14/178148c5-e543-4e59-9971-c9a4e839091a.png?resizew=269)
(1)用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
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