如图,方格纸中的每个小正方形的边长均为
,小正方形的顶点称为格点.已知
、
、
都是格点.
![](https://img.xkw.com/dksih/QBM/2021/1/26/2644012649635840/2645237423603712/STEM/6e9482b310c4489d99b93774c6c84645.png?resizew=205)
(1)小明发现
是直角,请补全他的思路;
小明的思路
(2)请用一种不同于小明的方法说明
是直角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/2021/1/26/2644012649635840/2645237423603712/STEM/6e9482b310c4489d99b93774c6c84645.png?resizew=205)
(1)小明发现
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
小明的思路
先利用勾股定理求出![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
20-21八年级上·江苏南京·期末 查看更多[2]
更新时间:2021-01-27 17:32:13
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解答题-证明题
|
适中
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名校
解题方法
【推荐1】在四边形
中,
是
边上一点,
点
从
出发以
秒的速度沿线段
运动,同时点
从
出发,沿线段
、射线
运动,当
运动到
,两点都停止运动.设运动时间为
(秒):
(1)当
与
的速度相同,且
时,求证:
(2)当
与
的速度不同,且
分别在
上运动时(如图1),若
与
全等,求此时
的速度和
值;
(3)当
运动到
上,
运动到射线
上(如图2),若
的速度为
秒,是否存在恰当的边
的长,使在运动过程中某一时刻刚好
与
全等,若存在,请求出此时
的值和边
的长;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c06a905c8ad7f004e06a89a5d9a34ac0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06ed1e3fb0760763b8ccac56e48f74b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bd251c1ee4a9eae0445804d2ad44c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a20cb2c77ea29b6eabbc477bc3743859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/25/c91ba1ac-1d49-4cab-b4f5-9f50bfebf9ea.png?resizew=235)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2a51944c720568f35d443589dfc1aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46b1019ae554bf55b4870ba028f0bc32.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b1b15a4605fce993cb13aefbf40360.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bc8ed75549798fa73ab4fa67f3d558.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b675765a93cc205832fb992368b0ed90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fe0c6bf2ca20c85202809ce14f8b85c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95d531d90feabc1b9f5c603caa8bbfc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5dbede0ae298e66ca5af37df8754aac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72303f58617deee68022d7cc2dc4ef46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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解答题-问答题
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【推荐2】【问题情境】
如图1,正方形
中,以
为斜边在正方形内构造
,使
,将
绕点D按逆时针方向旋转
,得到
(点C的对应点为A),延长
交
于点F,连接
.
请根据图1完成下列问题:
(1)若
,则
______度;
(2)试判断四边形
的形状,并给予证明:
【拓展探究】
(3)如图2,若
,请写出线段
与
的数量关系,并说明理由.
(4)如图1,若
,请直接写出线段
的长.
如图1,正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2598f844644c4245eb226ecca57ee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f864b11496cc738c29a737267cfc07cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2598f844644c4245eb226ecca57ee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f3f4656a7cb49737734202bdcd460f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bf97f9082d7f40bc680cc2c58865309.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
请根据图1完成下列问题:
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e7ed7bc043b2f418a4553e0714d57dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4339dca8d6c9f99f91eb4410fcc6396.png)
(2)试判断四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f705464fbec8ef8056513617ac20cc8.png)
【拓展探究】
(3)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df1ac3ab8d3ce5e61fd2f89761f80976.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f574463a3c3541e3e42cf7e1fee8e13.png)
(4)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41b9aa2f14bd344e0c696725c81b891a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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解答题-作图题
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适中
(0.65)
名校
【推荐1】如图,在
中,
,
,
三边的长分别为
,求这个三角形的面积. 小明同学在解答这道题时,先建立一个正方形网格(每个小正方形的边长为1),再在网格中画出格点
(即
的三个顶点都在小正方形的顶点处),如图1所示,这样不需要
的高,借用网格就能计算出它的面积..
的面积为___________;
(2)如果
三边的长分别为
,请利用图2的正方形网格(每个小正方形的边长为1)画出相应的格点
,并直接写出
的面积为___________,
边的高
___________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d23b488f961d9fde37feb7f5c497c0d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29518f264bf65ccb559e15a83e7e615c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d23b488f961d9fde37feb7f5c497c0d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d23b488f961d9fde37feb7f5c497c0d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64a6a09084a4fbcd479b6f86441ef0e6.png)
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解答题-作图题
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适中
(0.65)
【推荐2】如图,方格纸中每个小正方形的边长均为1,线段
的端点均在小正方形的顶点上,请按要求画出图形,使得它们的顶点均在小正方形的顶点上.
![](https://img.xkw.com/dksih/QBM/2021/5/20/2725115935383552/2740515284762624/STEM/a5aac292-ddd7-4c96-8385-b6966c0f2f1b.png)
(1)在图中画一个以
为直角边的直角三角形
,且
为轴对称图形;
(2)画一个面积为4的
,且
;
(3)连接
,请直接写出线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2021/5/20/2725115935383552/2740515284762624/STEM/a5aac292-ddd7-4c96-8385-b6966c0f2f1b.png)
(1)在图中画一个以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)画一个面积为4的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fde44c544c5845aa757b959efa27b533.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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解答题-作图题
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名校
【推荐1】在如图所示的正方形网格中,每个小正方形的边长都是1,△ABC的顶点都在正方形网格的格点(网格线的交点)上.
(1)请在如图所示的网格平面内作出平面直角坐标系,使点A坐标为(1,3),点B坐标为(2,1);
(2)请作出△ABC关于y轴对称的△A'B'C',并写出点C'的坐标;
(3)△ABC是 三角形,理论依据 .
(1)请在如图所示的网格平面内作出平面直角坐标系,使点A坐标为(1,3),点B坐标为(2,1);
(2)请作出△ABC关于y轴对称的△A'B'C',并写出点C'的坐标;
(3)△ABC是 三角形,理论依据 .
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893773988118528/2894813374078976/STEM/6c55ae8d-9102-4804-81a9-63348128a347.png?resizew=158)
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解答题-作图题
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【推荐2】如图,这是一个4×4的正方形网格,设每个小正方形的边长都是1.
(1)在图①网格中画出格点直角三角形(三角形的顶点都在小正方形的顶点处的三角形称为格点三角形,下同),使其斜边的长为无理数,两直角边长是有理数.
(2)在图②网格中画出格点直角三角形,使其三边的长都是无理数.
(3)在图③网格中画出格点等腰三角形,使其至少有一条边的长是无理数.
(1)在图①网格中画出格点直角三角形(三角形的顶点都在小正方形的顶点处的三角形称为格点三角形,下同),使其斜边的长为无理数,两直角边长是有理数.
(2)在图②网格中画出格点直角三角形,使其三边的长都是无理数.
(3)在图③网格中画出格点等腰三角形,使其至少有一条边的长是无理数.
![](https://img.xkw.com/dksih/QBM/2021/12/18/2874973103824896/2880990769709056/STEM/07cfe596-a096-47a0-8372-f312e7e1db42.png?resizew=512)
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