1 . 如图,
是边长为1的等边三角形,取
边中点
作
,
,得到四边形
,它的面积记作
,取
中点
作
,
,得到四边形
,它的面积记作
……,照此规律作下去,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c2864e2ec3416cc4c081ac1f71a0af.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a338aeca50edcba2a34d9472f3b9844.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fedf634c305704c1c13cb0353d5dc7c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e35c534ee351308fbbc2dd287147235.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/522230546d4b802094e86ceb48c2ba38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce220ebdafba01c154b92aecb7971687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6341f44cd658dad7b37c4612204dd8ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24248c60ffd67a44f2fd7c9236d6106e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c2864e2ec3416cc4c081ac1f71a0af.png)
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2 . 如图1,
中,
,
,
,点D,E分别为
,
的中点,点P为
上一个动点,过点E作
,垂足为点Q,设
,C,Q两点的距离为
,E,Q 两点的距离为
.小明根据学习函数的经验,对函数
和
随自变量x的变化而变化的规律进行了探究.
(1)自变量x的取值范围是 .
(2)通过取点、画图、测量,得到了x与y的几组值,如下表:
请直接写出
;
(3)如图2,在平面直角坐标系
中,描出以补全后的表中各对对应值为坐标的点,画出
随自变量x的变化而变化的函数图象.
(4)结合画出的函数图象,解决问题:当
为等腰三角形时,x的值约为
.(数值保留一位小数)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c545764505bb00578a870c5e39493a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1cd4a1c8087ef697d82b321a3331211.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/28719b1c54dd019b73f255e4f8b9973b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecc37d3558570e6bbb9c98e08d5641a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38703a1be638e22eb5d06e315fbff406.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/469490cb0402f8cf5a51a143dd9e124f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
(1)自变量x的取值范围是 .
(2)通过取点、画图、测量,得到了x与y的几组值,如下表:
x/![]() | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
![]() ![]() | 0 | 0.93 | 2.25 | 3.72 | 4.73 | m | 4.88 | 4.68 | 4.47 | 4.30 | 4.16 |
![]() ![]() | 3 | 3.69 | 4.48 | 4.98 | 4.75 | n | 3.25 | 2.68 | 2.24 | 1.31 | 1.66 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
(3)如图2,在平面直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
(4)结合画出的函数图象,解决问题:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86643348a8164750d9aefcfe20fecb7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
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名校
3 . 如图,
是边长为2的等边三角形,取
边的中点E,作
,
,得到四边形
,它的面积记作
;取
边的中点
,作
,
,得到四边形
,它的面积记作
,…,照此规律作不去,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c0aa4c793921fdaa5d430cb90d78ca6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a24ee04b7e461c045431ce83d15a91de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e35c534ee351308fbbc2dd287147235.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/522230546d4b802094e86ceb48c2ba38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce220ebdafba01c154b92aecb7971687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6341f44cd658dad7b37c4612204dd8ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24248c60ffd67a44f2fd7c9236d6106e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b50ec7342673cc1f11b613c3efd3c6c.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
4 . 如图,
是边长为1的等边三角形,取
的中点
,作
,
,得到四边形
,它的面积记为
,取
的中点
,作
,
,得到四边形
,它的面积记作
,照此规律,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b2778e2dadff4d91102e6046bb5def8.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a338aeca50edcba2a34d9472f3b9844.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fedf634c305704c1c13cb0353d5dc7c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bde0ab1051f1315fc165fd5fabf23ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/522230546d4b802094e86ceb48c2ba38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67630cabca4bf5bb4b288d08995a80fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6341f44cd658dad7b37c4612204dd8ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24248c60ffd67a44f2fd7c9236d6106e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b2778e2dadff4d91102e6046bb5def8.png)
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名校
5 . 阅读材料:当一个三角形的两个内角有倍数关系时,此三角形会有一些特殊的性质,如图,
中,
,我们称之为省重三角形,做
,小明发现以下性质并给出如下证明:
在
上取一点E,使
,连接
,
∵
,
,
∴
,
∴
,
∵
,
∴
,
∴
,
∴
,
∴
,即![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b7504023d3887bae858c6a0a8d0d3b7.png)
请直接应用小明发现的规律,完成下列问题:
(1)如图1,已知:在省重
中,
,
,
,则
的面积
________.
(2)如图2,在省重
中,
,F为
中点,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/becde6c2696e00bb6c8936c6fba10a99.png)
(3)如图3,平行四边形
,对角线交于点O,
,
,
,
,
,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88dc4d22c2c289f6d4494b9c2be84407.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e792b0ef3d542237ed0903194597651.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e792b0ef3d542237ed0903194597651.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a277db452e76240ec83ec6a2864bdd.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/898611813e24a744cd32df978e1e5c40.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88dc4d22c2c289f6d4494b9c2be84407.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50337fad727f63b856a2cb342cd230c1.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75c5021da4d89ed3ec7f90e7ed802d7f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49c6a75810f40beeeb4a7de546a94303.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942d4585ad9a70afd4601f1da4527822.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b7504023d3887bae858c6a0a8d0d3b7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/7/f91ea215-d1b0-48ed-89dd-ebf15d8a4cd5.png?resizew=358)
请直接应用小明发现的规律,完成下列问题:
(1)如图1,已知:在省重
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f01c4faacedfe56f5127d6c0cc63cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
(2)如图2,在省重
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/becde6c2696e00bb6c8936c6fba10a99.png)
(3)如图3,平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d320f180419175d75eebc618cc458b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86afd4f2661a9208c4e600e318408777.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1481cad5968b766f7b309541ed1b252.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48813b8fc61cdb0c54fbc6a2e4bbd30b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbc39144b305c67d44410d41053a1d28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
6 . 如图,
是边长为
的等边三角形.取
边中点
,作
,
,得到四边形
,它的面积记作
;取
中点
,作
,
,得到四边形
,它的面积记作
.照此规律作下去,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d238a52feae87b0778ba324dc144d50.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a338aeca50edcba2a34d9472f3b9844.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a24ee04b7e461c045431ce83d15a91de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bde0ab1051f1315fc165fd5fabf23ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/522230546d4b802094e86ceb48c2ba38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce220ebdafba01c154b92aecb7971687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6341f44cd658dad7b37c4612204dd8ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24248c60ffd67a44f2fd7c9236d6106e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d238a52feae87b0778ba324dc144d50.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/13/a2360b52-bc27-499e-b5a2-9752cf106610.png?resizew=145)
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名校
7 . 【模型建立】
设
的面积为1.如图1,分别将
,
边2等分,
,
是其分点,连接
,
交于点
,得到四边形
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/27/ec5cdb86-8ae2-4aad-8301-7c10ebd9b323.png?resizew=502)
(1)则
的面积
______;
______.
(2)四边形
的面积
______.
【问题探究】
(3)如图2,分别将
,
边3等分,
,
,
,
是其分点,连接
,
交于点
,得到四边形
,其面积
______;
如图3分别将
,
边4等分,
,
,
,
,
,
是其分点,连接
,
交于点
,得到四边形
,其面积
______;
……按照这个规律进行下去,若分别将
,
边n等分,…,得到四边形
,其面积
______.
【拓展延伸】
(4)如图4,
中,
,
,
,
,
,四边形
的面积
______.
设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/522230546d4b802094e86ceb48c2ba38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b7287da1de38b00f62a255ab1b9c6d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37bc5152b5b0668f2328dfe64cc761a1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/27/ec5cdb86-8ae2-4aad-8301-7c10ebd9b323.png?resizew=502)
图1 图2 图3 图4
(1)则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b165ddba676e76468ca377138ea2795.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9e28affd4b1aac2a15d089e3dc8d9ae.png)
(2)四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37bc5152b5b0668f2328dfe64cc761a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
【问题探究】
(3)如图2,分别将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c296e45b84cf67a98939aa7334e7d478.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/522230546d4b802094e86ceb48c2ba38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b4f150ab98bde511e0f65d9bafab031.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a8085882b23d697348eae30de9739f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177c27d20eef8a55f55232be139fc0b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/527c4aa78a9f682361076d52c0e1f507.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
如图3分别将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c296e45b84cf67a98939aa7334e7d478.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8ce8c07e34224e2d25130ed27c9a98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/522230546d4b802094e86ceb48c2ba38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b4f150ab98bde511e0f65d9bafab031.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b4dbe5d5c8b9c28c6f5eb92278a9f17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0e0f43ddba92ca23f0c098d756f8bc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cd3e83133639d81f381d54f1ef559af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1282962a17a48a18edf733204054d67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06752fcc8d2610873d824380708b03f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
……按照这个规律进行下去,若分别将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0459cba97d71e8c8e5f8262ea26c1f91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
【拓展延伸】
(4)如图4,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50f218914337edd06e59e75d90b777e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/874cc45870abbf7ee9588efe98e42782.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68e744f480e11f588570c5d6738799f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea2f3df5713a423887c16e6355236372.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
您最近一年使用:0次
8 . 如图,在等边
中,
,点
是
的中点,点
是边
上一个动点,连接
,
.设
,
两点间的距离为
,
.
随自变量
的变化而变化的规律进行了探究.下面是小明的探究过程,请补充完整:
(1)按照下表中自变量x的值进行取点、画图、测量,得到了
与
的几组对应值:
的值为 (保留一位小数);
(2)在平面直角坐标系
中,描出补全后的表中各组数值所对应的点
,并画出函数
的图象;
①当
时,
两点间的距离约为
;
②当
时,
两点间的距离约为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6850a299395c314b8f8f2f8ca50c9895.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.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/ee3160fce05b551569b8c7b5de6dd8b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d37534a97d72588d93c8acc22981c343.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(1)按照下表中自变量x的值进行取点、画图、测量,得到了
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![]() | 0 | 0.5 | 1 | 1.5 | 2 | 2.5 | 3 | 3.5 | 4 | 4.5 | 5 |
![]() | 5 | 4.6 | 4.3 | 4.1 | 4.2 | ![]() | 4.6 | 5.1 | 5.6 | 6.2 | 6.8 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)在平面直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d9aa1d34d66a6876aa0566c8fc8b0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8076b511e27939c629762296b8cfd08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb76f9ee0c0298baa67d20080380dad3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23afc43a8c5b8cfe6bf2a1caed920c01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb76f9ee0c0298baa67d20080380dad3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
您最近一年使用:0次
9 . 数学模型可以用来解决一类问题,是数学应用的基本途径,通过猜想探究图形的变化规律,最终可以获得宝贵的数学经验,并将其运用到更广阔的数学天地.如图1,在等边
中,点
,
分别在边
,
上,
,连接
,
,点
,
,
分别是
,
,
的中点.
图1中
的形状是______;
(2)探究证明
把
绕点A逆时针方向旋转到图2的位置,
的形状是否发生改变?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.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/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
图1中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ed4c4e8edbd179f3fc38a6653f18c1.png)
(2)探究证明
把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ed4c4e8edbd179f3fc38a6653f18c1.png)
您最近一年使用:0次
2010·云南红河·中考真题
真题
名校
10 . 如图,在图
中,
、
、
分别是
的边
、
、
的中点,在图
中,
、
、
分别是
的边
、
、
的中点,
,按此规律,则第
个图形中平行四边形的个数共有______ 个.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/035a5a88e7e2d6ef2b47d992412a1f2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5ed513f56811aa1d314514c5c10d90a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afb6101e45f8d7013bc3dc4197188c0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14b49022a6f55817b5d7e3ab443b5491.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eb960b00b7d4985d659b62eb74f470a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ef3c9dd64ecdf6d1fc3ab081aeb6a23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6acfc9319b4dfcefd8f0bb0338f7cbf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bcc65bfd96beeb5f6a788d47ccdcf16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846a84e40de724b4c60a20c4faa194b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf872e34fbe75db509d3151395701b72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc689a0bf91e6384ca0bd3fb3fbfa0ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07096af3b99fd1cb11c31f19a2c6408e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
2024-04-23更新
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283次组卷
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34卷引用:云南省曲靖市麒麟区第六中学2023-2024学年八年级下学期数学期中模拟试题
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