(1)如图1,已知
,
为
的平分线上一点.连接
,
,在不作辅助线的情况下,能作为
的依据是_______(从
,
,
,
中选择一个填入).
(2)如图2,已知
,
,
为
的平分线上两点连接
,
,
,
;全等三角形的对数是_______;
(3)如图3,已知
,
,
,
为
的平分线上三点,连接
,
,
,
,
,
;全等三角形的对数是_______;
(4)依此规律,第
个图形中有全等三角形的对数是_______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/901d94b32038d99ef9e748f1fe2b8c55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cbfd199e0ba3e1ec7016a44454e7a3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec76570a0ddc83c103a4b77589d80701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a2ba04decd9d9204ec64d567af55721.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9970629e91021aa64fb871c83746418c.png)
(2)如图2,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.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/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(3)如图3,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(4)依此规律,第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/8/3eaa5ba8-0797-4893-a551-94e7e934887f.png?resizew=442)
更新时间:2022-04-17 08:56:08
|
相似题推荐
解答题-问答题
|
适中
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【推荐1】【问题提出】
每对小兔子在出生后1个月就长成大兔子,而每对大兔子每个月能生出1对小兔子来,如果1个人在1月份买了1对小兔子,假设每对兔子均可成活,且具有繁殖能力,那么理论上12月份的时候他共有多少对兔子?
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/7/4e372097-a766-40af-ab50-44584dace8a0.png?resizew=547)
(1)【问题探究】
1月份,有1对小兔子;
2月份,长成大兔子,所以还是1对;
3月份,大兔子生下1对小兔子,所以共有2对;
4月份,刚生下的小兔子长成大兔子,而原来的大兔子又生下1对小兔子,共3对;
…
依此类推,请填下表:
(2)【类比应用】
树木生长的过程中,新生的枝条往往需要一段“休息”时间供自身生长,而后才能萌发新枝.一棵苗在1年后长出1条新枝,第2年新枝“休息”,老枝依旧萌发新枝;此后,老枝与“休息”过1年的同时萌发新枝,当年生的新枝则依次“休息”,这在生物学上称为“鲁德维格定律”.那么,10年后树上有 条树枝.
(3)【综合应用】
如图①,一只蜜蜂从A处出发,回到家里B处,每次只能从一个蜂房爬向右侧邻近的蜂房而不准逆行,共有 种回家的方法;
(4)如图②,在正五边形ABCDE上,一只青蛙从点A开始跳动,每次可以随意跳到相邻两个顶点中的一个上,跳到点D上就停止跳动.青蛙在6次之内(含6次)跳到点D有 种不同的跳法.
每对小兔子在出生后1个月就长成大兔子,而每对大兔子每个月能生出1对小兔子来,如果1个人在1月份买了1对小兔子,假设每对兔子均可成活,且具有繁殖能力,那么理论上12月份的时候他共有多少对兔子?
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/7/4e372097-a766-40af-ab50-44584dace8a0.png?resizew=547)
(1)【问题探究】
1月份,有1对小兔子;
2月份,长成大兔子,所以还是1对;
3月份,大兔子生下1对小兔子,所以共有2对;
4月份,刚生下的小兔子长成大兔子,而原来的大兔子又生下1对小兔子,共3对;
…
依此类推,请填下表:
月份 | 1月份 | 2月份 | 3月份 | 4月份 | 5月份 | 6月份 | 7月份 | … | 12月份 |
兔子对数 | 1 | 1 | 2 | 3 |
|
|
| … |
|
树木生长的过程中,新生的枝条往往需要一段“休息”时间供自身生长,而后才能萌发新枝.一棵苗在1年后长出1条新枝,第2年新枝“休息”,老枝依旧萌发新枝;此后,老枝与“休息”过1年的同时萌发新枝,当年生的新枝则依次“休息”,这在生物学上称为“鲁德维格定律”.那么,10年后树上有 条树枝.
(3)【综合应用】
如图①,一只蜜蜂从A处出发,回到家里B处,每次只能从一个蜂房爬向右侧邻近的蜂房而不准逆行,共有 种回家的方法;
(4)如图②,在正五边形ABCDE上,一只青蛙从点A开始跳动,每次可以随意跳到相邻两个顶点中的一个上,跳到点D上就停止跳动.青蛙在6次之内(含6次)跳到点D有 种不同的跳法.
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解答题-问答题
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适中
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【推荐2】观察如图所示中的各图,寻找对顶角(不含平角):
![](https://img.xkw.com/dksih/QBM/2019/5/29/2214253801422848/2276252530352128/STEM/e6b3d652d9434af1b509a239e12d2975.png?resizew=412)
(1)如图a,图中共有___对对顶角;
(2)如图b,图中共有___对对顶角;
(3)如图c,图中共有___对对顶角.
(4)研究(1)~(3)小题中直线条数与对顶角的对数之间的关系,若有 n条直线相交于一点, 则可形成___对对顶角?
(5)若有2008条直线相交于一点,则可形成___对对顶角?
![](https://img.xkw.com/dksih/QBM/2019/5/29/2214253801422848/2276252530352128/STEM/e6b3d652d9434af1b509a239e12d2975.png?resizew=412)
(1)如图a,图中共有___对对顶角;
(2)如图b,图中共有___对对顶角;
(3)如图c,图中共有___对对顶角.
(4)研究(1)~(3)小题中直线条数与对顶角的对数之间的关系,若有 n条直线相交于一点, 则可形成___对对顶角?
(5)若有2008条直线相交于一点,则可形成___对对顶角?
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解答题-作图题
|
适中
(0.65)
【推荐1】如图,在
中,
是它的一条对角线.
;
(2)尺规作图:作
的垂直平分线
,分别交
,
于点E,F(不写作法,保留作图痕迹);
(3)连结
,若
,求
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aabbddb447b1889c86646b7bbf197216.png)
(2)尺规作图:作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcab066fee173cf267bfb5fa5c824ba1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a55a1a244f81097e05e715b69580faa.png)
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解答题-作图题
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适中
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名校
【推荐2】如图,正方形
中,点E是边
上的一点,连接
,过点A作
的垂线交
的延长线于点F,连接
,取
中点G,连接
.
(1)依意补全图形;用等式表示
与
的数量关系,并证明;
(2)若
,用等式表示线段BC与BE的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.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/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/15/bf8c18b9-10c8-4afa-8280-25e48f5d4f43.jpg?resizew=109)
(1)依意补全图形;用等式表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80525e6a8341ec50546b97e7b00d9e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64254c5dbc7252590f8f8dabe3dbb38c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be0708f21ac2a6e5c0472f28bbdfd9f8.png)
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解答题-问答题
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适中
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【推荐1】根据题意求各图中阴影部分的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/31/235fe770-5f1a-4f12-9f15-a60a98ce5b6e.png?resizew=518)
(1)如图1,在
中,
,
,以A为顶点,
为半径画弧,交
于D点.
(2)如图2,已知扇形的圆心角为
,半径为2.
(3)如图3,
是
的直径,弦
,
,
.
(4)如图4,半径为
,圆心角为
的扇形
中、分别以
、
为直径作半圆.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/31/235fe770-5f1a-4f12-9f15-a60a98ce5b6e.png?resizew=518)
(1)如图1,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/f121eabff3c62c1a196d9ca5f6f83f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)如图2,已知扇形的圆心角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
(3)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39776e9158fb382a3de6eb1572bcf02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
(4)如图4,半径为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c78d0ab561d0c9bb9099772c596af8bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4819c39c281427826e1b3f7a4c2b720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
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【推荐2】如图,正方形
的边长为
,
是边
上一点,过点
作
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/27/8cedf9a4-23f7-496f-bbe5-c7f95c9e27ea.png?resizew=160)
(1)设以线段
,
为邻边的矩形的面积为
,以
为边的正方形的面积为
,且
,求
的长;
(2)连接
,
,若
是
的中点,
交
于点
,连接
,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee73452ee4d5437f1399f1235b95e55f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/27/8cedf9a4-23f7-496f-bbe5-c7f95c9e27ea.png?resizew=160)
(1)设以线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.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/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31dd78e9156dcf6db93f6cbcc5b43b14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cadbafa0b186d12935905c32d9043622.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc8b62dc033d86ee9e561b8903796701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/999a995a6d07c561ce64e8952994160a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e78829dfbbc34559bac602e16728318.png)
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