因为四边形具有不稳定性,故将边长为1的正方形
压扁为边长为1的菱形
.在菱形
中,
,面积为
.
(1)请补全下表:
(2)填空:由(1)可以发现边长是1的正方形在压扁的过程中,菱形的面积随着
大小的变化.不妨把边长为1,
的菱形面积
记为
.例如:当
时,
,当
时,
,由上表可以得到
,
,
,由此可以归纳出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(3)将两块相同的等腰直角三角形按图②的方式放置,若
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd465973943bcd766b5275ee204bbf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/17/4b168553-3e7c-438b-a6be-74fe824093a6.png?resizew=518)
(1)请补全下表:
1 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd465973943bcd766b5275ee204bbf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8135ce2fc33a303efd2087106709d44e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c96cb3ac8290e09c55d4eb336a8608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e05698be40d36e4a939afa718ee91801.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3bea7383acbd1da6d0d5f10ef1b2aed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d53385b52a731e8421e5c7493d2838d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f39a4df03db5d12266c6a99a4cce3366.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1a4c0e21a7748a5f9feb422e6ab6b62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0db70fb4c216d319aead5eaf00ec1980.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1a4c0e21a7748a5f9feb422e6ab6b62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07096af3b99fd1cb11c31f19a2c6408e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/991ef82e9b3eae683d000d4bb6713fc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(3)将两块相同的等腰直角三角形按图②的方式放置,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d09d9ffa06ad6bff3a24d32f6d6325fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/733aab02483778232a43c4fa97105682.png)
更新时间:2023-08-01 10:39:36
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图1,在平面直角坐标系中,抛物线
与直线
交于点
,
,其中点
在
轴上,点
在
轴上.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/5/119c1197-7754-4e13-8066-7d9ca58cc8b5.png?resizew=352)
(1)求抛物线的函数解析式;
(2)
为直线
上方抛物线上的一个动点,过点
作
轴交直线
于点
,求
的最大值和此时点
的坐标;
(3)如图2,在(2)问的条件下,将抛物线沿射线
的方向平移,使得平移后的抛物线经过点
,
为新抛物线与
轴的交点,
是平移后新抛物线的对称轴上的动点.当
是以
为腰的等腰三角形时,请直接写出所有点
的坐标,并把求其中一个点坐标的过程写出来.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c9800e4b992044d16681e77ff6563c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc9118cc77fc0a045337745890e50cad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/5/119c1197-7754-4e13-8066-7d9ca58cc8b5.png?resizew=352)
(1)求抛物线的函数解析式;
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/548776b62e7a92e1b11f5aeaf4d52392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9454ba779f6c189aba16d63aae1abb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)如图2,在(2)问的条件下,将抛物线沿射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b05d6899d398fa4202a751d4c8981.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】婆罗摩笈多(Brahmagupta)是古代印度著名数学家、天文学家,他在三角形、四边形、零和负数的算术运算规则、二次方程等方面均有建树,他曾经提出了“婆罗摩笈多定理”,该定理也称为“古拉美古塔定理”,该定理的内容及部分证明过程如下:
古拉美古塔定理:如图①,四边形ABCD内接于
,对角线
,垂足为点M,直线
,垂足为点E,并且交直线AD于点F.则
.
![](https://img.xkw.com/dksih/QBM/2022/5/24/2986391220592640/2990507436089344/STEM/f862099c-0fd3-4d9f-ba8a-c1364e8e28ed.png?resizew=186)
证明:∵
,
,∴
,
∴
,
,∴
,
∵
,∴
.
又∵
,∴
,∴
.
…
任务:
(1)将上述证明过程补充完整;
(2)古拉美古塔定理的逆命题:如图②,四边形ABCD内接于
,对角线
,垂足为点M,直线FM交BC于点E,交AD于点F.若
,则
.请证明该命题.
古拉美古塔定理:如图①,四边形ABCD内接于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc0e7a1541a8db0c059fd6cd0c4c3620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d669d800ccb321f841f9b14c5d8300e.png)
![](https://img.xkw.com/dksih/QBM/2022/5/24/2986391220592640/2990507436089344/STEM/f862099c-0fd3-4d9f-ba8a-c1364e8e28ed.png?resizew=186)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc0e7a1541a8db0c059fd6cd0c4c3620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9da1280c61c261c1361fcb36853ffa6.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1eac970d3dfb214890afbfb71da291d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9e8f6d50d2a743179b76d391f1fe669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c150d2b263db88aa58937474eef28503.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e04447ae17344c0dadf26bfd4e04d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6447670ed2792f824bb30e3beb9463.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d3ca46e7136a797e62d0c6ac87795f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e93be900efe5090be0111fbbb1fc7647.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fff73edff653a42ff070f94f0bd08b1e.png)
…
任务:
(1)将上述证明过程补充完整;
(2)古拉美古塔定理的逆命题:如图②,四边形ABCD内接于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d669d800ccb321f841f9b14c5d8300e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc42287f66ae7c6c569eb8fa5a991e85.png)
![](https://img.xkw.com/dksih/QBM/2022/5/24/2986391220592640/2990507436089344/STEM/279903e1-f02a-4a5c-8f71-89021d789540.png?resizew=179)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
真题
【推荐1】如图,梯形ABCD中,AD//BC,AB=CD,对角线AC、BD交于点O,AC
BD,E、F、G、H分别为AB、BC、CD、DA的中点
(1)求证:四边形EFGH为正方形;
(2)若AD=2,BC=4,求四边形EFGH的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4237f6a1fc115bb790aa10704b7908c3.png)
(1)求证:四边形EFGH为正方形;
(2)若AD=2,BC=4,求四边形EFGH的面积.
![](https://img.xkw.com/dksih/QBM/2012/7/14/1573447969775616/1573448021057536/STEM/0f4310a3568f4f01b8948c549b307012.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图,平行四边形
中,
,过点D作
交
的延长线于点E,点M为
的中点,连接
.
是矩形;
(2)若
,且
,求四边形
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca14fa885a9d04f04e0418b49b118241.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58e65831c1e6103af4c0bb4a4a61b964.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efed5fff1b49993b5ed6a108293490bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3631e16abf04a5bd48c504e662a4aca9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58e65831c1e6103af4c0bb4a4a61b964.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】如图,在菱形
中,
,
,
是对角线
的中点,过
点作
丄
,垂足为
.
![](https://img.xkw.com/dksih/QBM/2018/11/21/2080289274298368/2082724950228992/STEM/ca63b221-9f85-4496-a265-51d372125335.png?resizew=163)
求
的度数;
求线段
的长;
求菱形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8bf495b10372c298f080be6b7c6eeaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76d527d4795ece4a5756d1cf8dba31e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/598c4ff9fc8518fa4829e39254d3f6e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2018/11/21/2080289274298368/2082724950228992/STEM/ca63b221-9f85-4496-a265-51d372125335.png?resizew=163)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/759f54cf31801644c7e447754ab95b3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4bb89a362c1faf4d0c306eabbb59710.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图1,在菱形
中,
,
.左右作平行移动的正方形
的两个顶点F、G始终在边
上.当点G到边
中点时,点E恰好在边
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/2/7a014574-29fa-4a7f-86e3-378c2db1a080.png?resizew=272)
(1)如图1,求正方形
的边长;
(2)设点B与点F的距离为x,在正方形
作平行移动的过程中,正方形
与菱形
重叠部分的面积为y,求y与x的函数解析式,并写出它的自变量的取值范围;
(3)连接
,当
是等腰三角形时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7099026716ee1821dd7d9f157dc055f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/2/7a014574-29fa-4a7f-86e3-378c2db1a080.png?resizew=272)
(1)如图1,求正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
(2)设点B与点F的距离为x,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c6ce5dc020e273fdc784454721f8007.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93f5a2ed40bffc15b379b4dcc68d379c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
您最近一年使用:0次