问题背景:如图1,等腰
中,
,作
于点D,则D为
的中点,
,于是
;
迁移应用:如图2,
和
都是等腰三角形,
,D,E,C三点在同一条直线上,连接
.
;
②请直接写出线段
之间的等量关系式;
拓展延伸:如图3,在菱形
中,
,在
内作射线
,作点C关于
的对称点E,连接
并延长交
于点F,连接
,
.
①证明
是等边三角形;
②若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d54cb14e377e3474e97365fc0e15f8.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/7eeb545ad4919ee00af43dd35d0488c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d026621bc4b2dbe4029364d8927801d3.png)
迁移应用:如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d959ad0bf10a92c6c6be067f7094fcb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f04c6fa60799fba2f89cd7bfeef1f4.png)
②请直接写出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0d3055b122bf4953a3d6cc92ab03d74.png)
拓展延伸:如图3,在菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e918b70b02a73685e3c536c7f380e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
①证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a806933a5b2364ea89db3cb3d4e8911.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
2018九年级·全国·专题练习 查看更多[17]
(已下线)2年中考1年模拟 第七篇 专题复习篇 专题38 开放探究问题(已下线)2年中考1年模拟 第四篇 图形的性质 专题19 全等三角形(已下线)决胜2018中考压轴题全揭秘 专题14三角形问题(已下线)决胜2018中考压轴题全揭秘 专题28 探究型问题【全国校级联考】四川省眉山市丹棱县2018届九年级中考联考模拟数学试题【全国百强校】四川省成都嘉祥外国语学校2017-2018学年八年级下学期期末考试数学试题河南省洛阳市2018-2019学年八年级下学期期末考试数学试题四川省成都七中实验学校2020届九年级上学期入学考试数学试题(已下线)专题21 成都中考B27压轴题专版(决胜2020年中考压轴题全揭秘精品)四川专用四川省达州市第一中学2019-2020学年九年级下学期第五次月考数学试题(已下线)【万唯原创】2018年河南省中考数学试题研究-河南试卷-河南重难题型研究解答题重难点突破题型7(已下线)【万唯原创】2018年河南省中考数学面对面正文第二部分专题7(已下线)【万唯原创】2019年河南省中考数学面对面 专题八类比、拓展探究题2018年四川省眉山市丹棱县九年级中考一诊数学试题2020年包头市昆山区初中升学考试模拟卷(三)数学广东省深圳市深圳实验学校初中部2023-2024学年九年级上学期月考数学试题湖北省武汉市东西湖区2023-2024学年九年级下学期期中数学试题
更新时间:2020-07-20 23:45:42
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解答题-问答题
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【推荐1】下面是某数学兴趣小组对一个数学问题作的探究活动:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/27/c7c62b7d-484e-49a2-b977-eb78766278cb.png?resizew=265)
(1)如图1,小明同学得出
,他的判断理由是( )
A.
B.
C.
D.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a2ba04decd9d9204ec64d567af55721.png)
(2)如图2,小颖同学作
于D,她认为
与
存在某种数量关系,那么
与
是否有数量关系?如果有数量关系,请你写出
与
的数量关系并说明理由;
(3)如图1,小华说,当
,当
是直角三角形时,可求出
的值,请你直接写出
的值.
问题: 如图1,已知, ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/27/c7c62b7d-484e-49a2-b977-eb78766278cb.png?resizew=265)
(1)如图1,小明同学得出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4231cbe93d49df13aaa36221da62594.png)
A.
![](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/9970629e91021aa64fb871c83746418c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a2ba04decd9d9204ec64d567af55721.png)
(2)如图2,小颖同学作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb586785647b81ed737b09b40cabdf85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(3)如图1,小华说,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9774f83067ed956a551bc41adcce0469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b4dcc093218443f71a046b6df94bbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fe13fc149eeb17f119b12163ace88bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fe13fc149eeb17f119b12163ace88bd.png)
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【推荐2】如图1,已知在平面直角坐标系xOy中,四边形OABC是矩形,点A,C分别在x轴和y轴的正半轴上,连结AC,OA=3,tan∠OAC
,D是BC的中点.
(2)如图2,M是线段OC上的点,OM
OC,点P是线段OM上的一个动点,经过P,D,B三点的抛物线交x轴的正半轴于点E,连结DE交AB于点F.
①将△DBF沿DE所在的直线翻折,若点B恰好落在AC上,求此时BF的长和点E的坐标;
②以线段DF为边,在DF所在直线的右上方作等边△DFG,当动点P从点O运动到点M时,点G也随之运动,请直接写出点G运动路径的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b8a8c23e2d89b7e124bc5ff2c20616f.png)
(2)如图2,M是线段OC上的点,OM
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed94c3c1e19907813690dcd380de6318.png)
①将△DBF沿DE所在的直线翻折,若点B恰好落在AC上,求此时BF的长和点E的坐标;
②以线段DF为边,在DF所在直线的右上方作等边△DFG,当动点P从点O运动到点M时,点G也随之运动,请直接写出点G运动路径的长.
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【推荐1】
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/7c04d8d0-cf2e-4883-8dd4-ae394fececc7.png?resizew=311)
(1)发现,如图1 , 在平面内, 已知
的半径为
为
外一点, 且
为
A上一动点, 连接
, 易得
的最大值为___________,最小值为__________.(用含
的代数式表示)
(2)应用,①如图2, 在矩形
中,
为
中点,
为
边上一动点, 在平面内沿
将
翻折得到
, 连接
, 则
的最小值为___________.
②如图3,
为线段
外一动点,分别以
为直角边,
为直角顶点,作等腰
和等腰
, 连接
. 若
, 求
的最大值.
(3)拓展:如图4, 已知以
为直径的半
为
上一点,
为弧
上任意一点,
交
, 连接
, 若
, 则
的最小值为____________.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/7c04d8d0-cf2e-4883-8dd4-ae394fececc7.png?resizew=311)
(1)发现,如图1 , 在平面内, 已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b6003d92828bcdfdcff4087b696fa2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e89a939e01b0ffcd80268559c13c962d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/091e86ca89e484b331fd90125a5e5af3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5e58e5a299e7b6b508c61244b93ae1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4ee9327cfae484f1492cb4cb605a6ca.png)
(2)应用,①如图2, 在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff224f43719421b021f561fefea56e39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060b94d19c83489f53e11265635c41d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
②如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a1dd47d59b9755e1815f18f3e22ef81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7c31c23787ef2f87f9fd34ff45ee2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d669994eff129bf0c2f9e27082ba160e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6c8b21a087818284c9cd909cc56c814.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11c0cc023ca94310398e8dc2c3db11cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(3)拓展:如图4, 已知以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4cb58609f025db6982dd397f09e24e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50633739e25e29b6d4b8ef9ef1c98c00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13364e790991f8b628548ae05f6879f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3405c626121b0ef79adc13463f2f0d71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/966b9be6451da86f014d71882aacc0fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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【推荐2】综合与探究
在数学综合与实践课上,老师让同学们以“两个含
角的完全相同的直角三角形拼摆”为主题开展教学活动.
(1)将三角形较长的直角边靠在一起,拼成了如图
所示的三角形,则
是等边三角形,理由是______;
(2)实验小组将图
中的
以点
为旋转中心,按逆时针旋转
(
),旋转后得到
,如图
所示,
与
相交于点
,连接
.
①求
的大小(用含有
的式子来表示);
②当
时,求证:
垂直平分
.
在数学综合与实践课上,老师让同学们以“两个含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/4/40ae6428-db04-41f5-bef5-e37537963075.jpg?resizew=446)
(1)将三角形较长的直角边靠在一起,拼成了如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)实验小组将图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708d48b595c17d4dccf9b4086d7e664e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64ccefd9b5b75dd9badc1bf21bdf7a2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24cfad1ba71a78d8f415335cde2f8c52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e7b8a59f8d66176463f3d71f882a26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fc142ed17b001ebc0030e5513ac8d72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a21897349d3d7c94419692106887153.png)
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真题
【推荐1】已知:在△ABC外分别以AB,AC为边作△AEB与△AFC.
![](https://img.xkw.com/dksih/QBM/2019/10/8/2307602212593664/2308105335644160/STEM/1352a5735bb04948901065b89943179a.png?resizew=375)
(1)如图1,△AEB与△AFC分别是以AB,AC为斜边的等腰直角三角形,连接EF.以EF为直角边构造Rt△EFG,且EF=FG,连接BG,CG,EC.
求证:①△AEF≌△CGF;②四边形BGCE是平行四边形.
(2)小明受到图1的启发做了进一步探究:
如图2,在△ABC外分别以AB,AC为斜边作Rt△AEB与Rt△AFC,并使∠FAC=∠EAB=30°,取BC的中点D,连接DE,EF后发现,两者间存在一定的数量关系且夹角度数一定,请你帮助小明求出
的值及∠DEF的度数.
(3)小颖受到启发也做了探究:
如图3,在△ABC外分别以AB,AC为底边作等腰三角形AEB和等腰三角形AFC,并使∠CAF+∠EAB=90°,取BC的中点D,连接DE,EF后发现,当给定∠EAB=α时,两者间也存在一定的数量关系且夹角度数一定,若AE=m,AB=n,请你帮助小颖用含m,n的代数式直接写出
的值,并用含α的代数式直接表示∠DEF的度数.
![](https://img.xkw.com/dksih/QBM/2019/10/8/2307602212593664/2308105335644160/STEM/1352a5735bb04948901065b89943179a.png?resizew=375)
(1)如图1,△AEB与△AFC分别是以AB,AC为斜边的等腰直角三角形,连接EF.以EF为直角边构造Rt△EFG,且EF=FG,连接BG,CG,EC.
求证:①△AEF≌△CGF;②四边形BGCE是平行四边形.
(2)小明受到图1的启发做了进一步探究:
如图2,在△ABC外分别以AB,AC为斜边作Rt△AEB与Rt△AFC,并使∠FAC=∠EAB=30°,取BC的中点D,连接DE,EF后发现,两者间存在一定的数量关系且夹角度数一定,请你帮助小明求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b942540f5329b8531868993a54b434e8.png)
(3)小颖受到启发也做了探究:
如图3,在△ABC外分别以AB,AC为底边作等腰三角形AEB和等腰三角形AFC,并使∠CAF+∠EAB=90°,取BC的中点D,连接DE,EF后发现,当给定∠EAB=α时,两者间也存在一定的数量关系且夹角度数一定,若AE=m,AB=n,请你帮助小颖用含m,n的代数式直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b942540f5329b8531868993a54b434e8.png)
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名校
【推荐2】如图,在Rt△ABC中,∠ACB=90°,AC=3,AB=5.点P从点A出发,以每秒5个单位
长度的速度沿AC方向运动,过点P作PQ⊥AB于点Q,当点Q和点B重合时,点P停止运动,以AP和AQ为边作▱APHQ.设点P的运动时间为t秒(t>0)
(1)线段PQ的长为 .(用含t的代数式表示)
(2)当点H落在边BC上时,求t的值.
(3)当▱APHQ与△ABC的重叠部分图形为四边形时,设四边形的面积为S,求S与t之间的函数关系式.
(4)过点C作直线CD⊥AB于点D,当直线CD将▱APHQ分成两部分图形的面积比为1:7时,直接写出t的值.
长度的速度沿AC方向运动,过点P作PQ⊥AB于点Q,当点Q和点B重合时,点P停止运动,以AP和AQ为边作▱APHQ.设点P的运动时间为t秒(t>0)
(1)线段PQ的长为 .(用含t的代数式表示)
(2)当点H落在边BC上时,求t的值.
(3)当▱APHQ与△ABC的重叠部分图形为四边形时,设四边形的面积为S,求S与t之间的函数关系式.
(4)过点C作直线CD⊥AB于点D,当直线CD将▱APHQ分成两部分图形的面积比为1:7时,直接写出t的值.
![](https://img.xkw.com/dksih/QBM/2018/9/29/2042805394849792/2043427125223424/STEM/39ea93114c4145d5b3bf6f89e8c839f5.png?resizew=181)
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【推荐3】如图1,点
在射线
上,且
,过点
在射线
上方作射线
,且
,点
从点
出发,沿
方向以每秒2个单位长度的速度运动,同时点
从点
出发,沿
方向以每秒1个单位长度的速度运动,当点
到达点
时,点
,
都停止运动.以点
为圆心,
为半径的半圆与射线
交于点
,与射线
交于点
,连接
,
,设运动时间为
秒(
).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/30/ec67cb0b-157a-4c73-b2bc-fde4dec9b8bb.png?resizew=689)
(1)用含
的式子表示
的长为___________;当点
与点
重合时,
的长为___________;
(2)若
与半圆
相切,求
的长;
(3)如图2,当
时,
与半圆
的另一个交点为
,连接
,求
的度数及
的长;
(4)若半圆
与线段
只有一个公共点,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30ea2ed91a9d38a44ff9422648dfed4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/347af52a90d3b53c388300041ba508b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.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/2023/1/30/ec67cb0b-157a-4c73-b2bc-fde4dec9b8bb.png?resizew=689)
(1)用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.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/a299d2b999568e80be8005565ba209a4.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
(3)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ada7c406cac4bb96ce95ae134c207b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ea2f6098be91fa704dc562b62471362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5e4a420fdda2872433342098ee04c6.png)
(4)若半圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
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