【综合与实践】
课本64页安排这样的数学活动:折纸作
,
,
的角:如果我们身旁没有量角器或者三角尺,又需要做
,
,
等大小的角,可以采用下面的方法:
动手操作:如图1,(1)对折矩形纸片
,使
与
重合,得到折痕
,把纸片展开;(2)再一次折叠纸片,使点A落在
上,并使折痕经过点B,得到折叠
,同时得到线段BN.
观察猜想:图中等于
的角是:______(写出一个角即可);等于
的角是:______(写出一个角即可)
推理验证:任选以上一个猜想结论给予证明.
拓展延伸:将矩形纸片换成正方形纸片,按以上步骤折叠,并延长
交
于点Q,连接
得到图2,若
,直接写出
的长.
课本64页安排这样的数学活动:折纸作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c12e76fbd84eeec721386bd3b04cc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c12e76fbd84eeec721386bd3b04cc4.png)
动手操作:如图1,(1)对折矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
观察猜想:图中等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
推理验证:任选以上一个猜想结论给予证明.
拓展延伸:将矩形纸片换成正方形纸片,按以上步骤折叠,并延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc5c276923c1a46eaf18193604fdb6b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/6/9ef52a7f-8e90-4074-8afe-f833ccc91f9d.png?resizew=364)
更新时间:2023-07-03 12:21:52
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】如图
,将矩形纸片
沿过点
的直线折叠,使点
落在
上的点
处,得到折痕
,然后把纸片展平
然后再将图
中的矩形纸片
沿过点
的直线折叠,点
恰好落在
上的点
处,
落在点
处,得到折痕
,
交
于点
,
交
于点
,再把纸片展平,如图
所示.
![](https://img.xkw.com/dksih/QBM/2023/6/16/3260742438412288/3262896101761024/STEM/aa31e9a512e14f57b1624a5ba0cc6368.png?resizew=366)
(1)如图
,线段
与
是否相等?若相等,请给出证明:若不等,请说明理由;
(2)如图
,若
,
,求
:
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc8396a7120abeaae6236a9292e5b9f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54e1d0f65817ba32a732040518f41440.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31ef73bd07011d88bab2e4223b2631af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/452df36e8b63a8e92d773d1ac44c2081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54c20b6dab50010f7a5eef15fecc72f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8474d32657ef6a75c4ad707b850cb3ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://img.xkw.com/dksih/QBM/2023/6/16/3260742438412288/3262896101761024/STEM/aa31e9a512e14f57b1624a5ba0cc6368.png?resizew=366)
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3027a6c8edbc9a738a337fb722feb16b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad8791476ac30d8934be008fd1eb9f63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbd9c7da8afce59d37e4a861933feaa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
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【推荐2】定义:我们把形如
(
)的函数称为一次函数
的“相反函数”.比如:函数
是一次函数
的“相反函数”.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/3/019ae920-5440-4ea3-9786-584ffa1b2c83.png?resizew=290)
(1)如图1,一次函数
的图象交
轴、
轴于点
、
,请在图中画出该一次函数的“相反函数”
的图象;
(2)写出一次函数
与“相反函数”
(
)之间的性质(至少两条);
(3)在(1)中,如果函数
、
的图象交点为
,
、
与
轴分别交于点
、
.求
的角平分线与对边的交点坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53bafd9c838624fcf49967608b8e240b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2c80c26a794a844127aae7dee87c93b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ceae2195a53fbdefb4539e04326b232a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/650353eda77d014bb42d185bd967e549.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/3/019ae920-5440-4ea3-9786-584ffa1b2c83.png?resizew=290)
(1)如图1,一次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cfa2a6d9749a619edf80bad8b3e4962.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fed700b7a3ab2ee7fbae12507033af9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
(2)写出一次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53bafd9c838624fcf49967608b8e240b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2c80c26a794a844127aae7dee87c93b.png)
(3)在(1)中,如果函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/15c0dbe3c080c4c4636c64803e5c1f76.png)
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名校
【推荐1】在平面直角坐标系
中,对于点P,点M给出如下定义:如果点P与原点O的距离为a,点M与点P的距离是a的k倍(k为整数),那么称点M为点P的“k倍关联点”.
(1)当
时,
①如果点
的4倍关联点M在x轴上,那么点M的坐标为____________;
②如果点
是点
的k倍关联点,且满足
,
,那么整数k的最大值为______;
(2)已知在
中,
,
,
,
.若
,且在
的边上存在点
的4倍关联点Q,求b的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a28770a56f456dd03f3ea6b90af5ae1f.png)
①如果点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
②如果点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d259822ab64b8626f3893b8432673358.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fd350b6152b89811ca2d0da657b13c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef62f305120bed416bdb931836b9df6a.png)
(2)已知在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392b9e1a179a6676362679354a9e7e51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a097e45af92e66b55b25eb102b8ce5f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6de77d9719138d7d54b63e1fbdc5edc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa23a3a8e235e9b941349310d35cc4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9cb8e6ff801523b0304576cd69fd2d.png)
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【推荐2】已知四边形ABCD中,AB⊥AD,BC⊥CD,AB=BC,∠ABC=120°,∠MBN=60°,∠MBN绕B点旋转,它的两边分别交AD,DC(或它们的延长线)于E、F.
(1)当∠MBN绕B点旋转到AE=CF时(如图1),试猜想AE,CF,EF之间存在怎样的数量关系?请将三条线段分别填入后面横线中: + = .(不需证明)
(2)当∠MBN绕B点旋转到AE≠CF(如图2)时,上述(1)中结论是否成立?请说明理由.
(3)当∠MBN绕B点旋转到AE≠CF(如图3)时,上述(1)中结论是否成立?若不成立,线段AE,CF,EF又有怎样的数量关系?请直接写出你的猜想,不需证明.
(1)当∠MBN绕B点旋转到AE=CF时(如图1),试猜想AE,CF,EF之间存在怎样的数量关系?请将三条线段分别填入后面横线中: + = .(不需证明)
(2)当∠MBN绕B点旋转到AE≠CF(如图2)时,上述(1)中结论是否成立?请说明理由.
(3)当∠MBN绕B点旋转到AE≠CF(如图3)时,上述(1)中结论是否成立?若不成立,线段AE,CF,EF又有怎样的数量关系?请直接写出你的猜想,不需证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/831610c1-1fa3-4c06-b7db-20dce56cf4a3.png?resizew=464)
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解答题-问答题
|
较难
(0.4)
【推荐1】综合与实践
问题情境:如图①,在矩形
中,
,沿对角线
折叠矩形并展开,再沿对角线
折叠矩形并展开,两次的折痕交于点O,点E是
上一点,连接
并延长交
于点F,连接
.
(1)请判断四边形
的形状并说明理由;
问题解决:
(2)在图①基础上将矩形沿
折叠得到图②,点A、C对应点分别为点
、
.
①请判断
与
的位置关系,并加以证明;
②连接
,当线段
的长最小时,请直接写出
的长.
问题情境:如图①,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0eb9ed77d586a7976de01e7551cdb23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90c780dac29ff8b7df5881d3b33abab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf22927eb6819a02978ef0c6b101f6f5.png)
(1)请判断四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2330c01a4d2b5b20f106e3e48834d5c0.png)
问题解决:
(2)在图①基础上将矩形沿
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf22927eb6819a02978ef0c6b101f6f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
①请判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e663220a66eff19da6a71e46b397db2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/900b844294e8c07ea9a858adb845121c.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24cfad1ba71a78d8f415335cde2f8c52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24cfad1ba71a78d8f415335cde2f8c52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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【推荐2】【操作与探究】
已知矩形
,给出如下操作过程:
如图①所示.将四边形
沿过点B的直线折叠,使折叠后的点C落在对角线BD上的点G处,折痕为
,将
沿过点G的直线折叠,使点A,点D分别落在边
,
上,折痕为
,得到一个新的矩形
.
![](https://img.xkw.com/dksih/QBM/2023/6/29/3269963303215104/3272201964445696/STEM/bcb85a6581214cccb92ed06126b615a8.png?resizew=389)
【问题探究】
(1)若图①中的四边形
是正方形,则矩形
的长宽比为__________,
__________.
(2)如图②,将如图①中的矩形
按照“操作与探究”中的方法再次操作,得到的新矩形
,则矩形
的长宽比为__________,
__________.
【问题解决】
若将长宽比
(n为正整数)矩形沿用上述方式操作m次后,得到一个矩形,则
__________,
________.
已知矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
如图①所示.将四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b312dab930cbbb9a4bb1a99f044dab73.png)
![](https://img.xkw.com/dksih/QBM/2023/6/29/3269963303215104/3272201964445696/STEM/bcb85a6581214cccb92ed06126b615a8.png?resizew=389)
【问题探究】
(1)若图①中的四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b312dab930cbbb9a4bb1a99f044dab73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c86d28146f40e4b34a33f5429848a358.png)
(2)如图②,将如图①中的矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b312dab930cbbb9a4bb1a99f044dab73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dae7f709cd4bf123f329605b2f9ea679.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dae7f709cd4bf123f329605b2f9ea679.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4120be75eb35e192b55989da26bf3e.png)
【问题解决】
若将长宽比
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa04174867877f8cf6d9c6d5229a0b4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/176d8571dce24731d8cc748abb5163fe.png)
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【推荐3】(1)【问题背景】
①如图1,在矩形
中,
,点
是
上一点,连接
,若
,则
= ;
②如图2,在正方形
,
点E在边
上,将
沿
翻折至
,连接
,求
周长的最小值;
(2)【问题解决】
如图3,某植物园在一个足够大的空地上拟修建一块四边形花圃
,点M是该花圃的一个入口,沿
和
分别铺两条小路,且
.管理员计划沿
边上种植一条绿化带(宽度不计),为使美观,要求绿化带的长度尽可能的长,那么管理员是否可以种植一条满足要求的长度最大的绿化带
?若可以,求出满足要求的绿化带
的最大长度(用含a的式子表示);若不可以,请说明理由.
①如图1,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c6e71a49b84b4764dc11982251457e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f3dba698e1c60d67592997e40742653.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686bc46b82feb6ce946951e8a9bdfea4.png)
②如图2,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca2698f08d94afa1cd5b81444791f4c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
(2)【问题解决】
如图3,某植物园在一个足够大的空地上拟修建一块四边形花圃
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff12065b4636e1380920294145e0af87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/21/990c2893-c81b-4dab-a3e7-d3183a5d14e7.png?resizew=474)
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【推荐1】(1)【问题发现】如图1,在
中,
,
,点
为
的中点,以
为一边作正方形
,点
恰好与点
重合,则线段
与
的数量关系为_______;
绕点
顺时针旋转,连接
,
,
,线段
与
的数量关系有无变化?请仅就图2的情形给出证明;
,且(2)中的正方形
绕点
顺时针旋转到
,
,
三点共线时,求出线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ac66de8543430fd51e7c18042e626dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ac66de8543430fd51e7c18042e626dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6060d9a82ed5405a1ea8cd824448b6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ac66de8543430fd51e7c18042e626dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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【推荐2】如图,在正方形
中,
,延长
至
,使
.以
、
为邻边作
.动点
从点
出发,以每秒2个单位的速度沿
向终点
运动,过点
作
交
或
的延长线于点
,以
为边向右作正方形
.设正方形
与
的重叠部分的面积为
,点
运动的时间为
(
,单位:秒).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/23/65c936e8-d62a-40b9-8cf7-901a8eed5516.png?resizew=314)
(1)用含
的代数式表示线段
为______;
(2)当点
与点
重合时,求
的值;
(3)当正方形
与
的重叠部分不是正方形时,用含
的代数式表示
;
(4)当
或
是锐角三角形时,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3699139ef137f5053d121cd22a653ebe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abbd75f5e846f0c89bcde1ff44a03a36.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/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c6f359362fa8af71be3517336ff5863.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134c3d2c318a33a82da4134dd17fa57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134c3d2c318a33a82da4134dd17fa57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abbd75f5e846f0c89bcde1ff44a03a36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fff6e7e2b9f2b68b1647f6350b98dc8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/23/65c936e8-d62a-40b9-8cf7-901a8eed5516.png?resizew=314)
(1)用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)当正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134c3d2c318a33a82da4134dd17fa57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abbd75f5e846f0c89bcde1ff44a03a36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(4)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b343ad6d49577cc2453693255fd30268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddc880c3faa907c3b952f7c948906842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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