1 . 问题探究:如图,在Rt△ABC和Rt△DEC中,∠ACB=∠DCE=90°,∠CAB=∠CDE=60°,点D为线段AB上一动点,连接BE.
![](https://img.xkw.com/dksih/QBM/2021/1/14/2635909391343616/2638851078569984/STEM/232e73f2-9159-4749-9b62-17951e6941c8.png)
(1)求证:△ADC∽△BEC.
(2)求证:∠DBE=90°.
拓展延伸:把问题探究中的“点D为线段AB上一动点”改为“点D为直线AB上一动点”,其他条件不变,若点M为DE的中点,连接BM,且有AD=1,AB=4,请直接写出BM的长度.
![](https://img.xkw.com/dksih/QBM/2021/1/14/2635909391343616/2638851078569984/STEM/232e73f2-9159-4749-9b62-17951e6941c8.png)
(1)求证:△ADC∽△BEC.
(2)求证:∠DBE=90°.
拓展延伸:把问题探究中的“点D为线段AB上一动点”改为“点D为直线AB上一动点”,其他条件不变,若点M为DE的中点,连接BM,且有AD=1,AB=4,请直接写出BM的长度.
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名校
2 . 探究:如图①,四边形ABCD为正方形,
,求证:
.
拓展:如图②,在
中,
,
,
,
于点E,交AB于F,则BF的值为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb91cb9a5a14169845d700fbd95890ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59a2e63e2e76266d606946a11c1d75de.png)
拓展:如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/630d82ae0ed6deb825514e0bc92e74a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8cabcef1cee1213140371c499339864.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b62ce0cbffa4758c7a0e6fb7ca4d24e.png)
![](https://img.xkw.com/dksih/QBM/2021/12/28/2888141706846208/2897287532421120/STEM/89f5bfeb-41ff-4d8c-987d-b13b9549a22d.png?resizew=306)
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3 . 下图是华师版九年级上册数学教材第63页的部分内容.
(1)【教材呈现】
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/3/6e32065a-3ed1-4cd0-892e-24eb1ae4069c.png?resizew=506)
根据教材内容,结合图①,给出例1的完整计算过程.
(2)【感知探究】如图②,
是△
的中线,连结
并延长,交
于点
,
=
,若
=2,则
= .
(3)【应用拓展】如图③,在△
中,点
为边
上的一点,且
=
,在射线
上取一点
,使
=
,连结
并延长交射线
于点
,若
.请直接写出四边形
的面积.
(1)【教材呈现】
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/3/6e32065a-3ed1-4cd0-892e-24eb1ae4069c.png?resizew=506)
根据教材内容,结合图①,给出例1的完整计算过程.
(2)【感知探究】如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb8f67bdef208fc8fbeb35e19bebb13f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
(3)【应用拓展】如图③,在△
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b840be5852709e18ea985954545e78d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8385faa3c5c3b2bbd7b0752f6f644a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.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/471b88327a64083fe10e4668f7f1fd00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe38c885f29722c433022c4b2ae6211.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/3/0b38cfb9-3554-4b61-8e16-c6e3907aaa44.png?resizew=525)
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4 . 【教材呈现】下图是华师版八年级下册教材第89页的部分内容.
请补全上述问题的证明过程 .
【探究】如图①,在
中,E,O分别是边AB、AC的中点,D、F分别是线段AO、CO的中点,连结DE、EF,将
绕点O旋转180°得到
,若四边形DEFG的面积为8,则
的面积为 .
【拓展】如图②,GH是正方形ABCD对角线AC上的两点,且AG=CH,GH=AB,E、F分别是AB和CD的中点.若正方形ABCD的面积为16,则四边形EHFG的面积为 .
例6:如图18.2.12,G、H是平行四边形ABCD对角线AC上的两点,且AG=CH,E、 F分别是边AB和CD的中点. ![]() 图18.2.12 求证:四边形EHFG是平行四边形. 证明:连结EF交AC于点O. ∵四边形ABCD是平行四边形, ∴AB=CD,AB∥CD. 又∵E、F分别是AB、CD的中点, ∴AE=CF. 又∵AB∥CD, ∴∠EAO=∠FCO. 又∵∠AOE=∠COF, ∴ ![]() |
【探究】如图①,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40277f2c88dc0b716383fc785df8ab7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
【拓展】如图②,GH是正方形ABCD对角线AC上的两点,且AG=CH,GH=AB,E、F分别是AB和CD的中点.若正方形ABCD的面积为16,则四边形EHFG的面积为 .
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/ead4c044-f797-4f70-bc0c-beb4712e3cf9.png?resizew=260)
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5 . 探究:如图①,点A、点 D在直线BC上方,且 AB⊥BC,DC⊥BC.点E是线段BC上的点,AE⊥DE.求证:△ABE∽△ECD.
应用:如图①,在探究的条件下,若BE=2,CD=4,DE=6,求AE的长.
拓展:如图②,矩形ABCD中,AB=12,BC=8.将矩形ABCD翻折,使点A落在边 CD上的点E处,折痕为MN.若DE=
DC,则BN = ________.
应用:如图①,在探究的条件下,若BE=2,CD=4,DE=6,求AE的长.
拓展:如图②,矩形ABCD中,AB=12,BC=8.将矩形ABCD翻折,使点A落在边 CD上的点E处,折痕为MN.若DE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://img.xkw.com/dksih/QBM/2020/10/15/2571783234076672/2573038232952832/STEM/2d616cac65f840adae4733d8043702ce.png?resizew=366)
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2020-10-17更新
|
262次组卷
|
3卷引用:吉林省长春市第四十七中2020-2021学年九年级上学期第一次月考数学试题
吉林省长春市第四十七中2020-2021学年九年级上学期第一次月考数学试题江西省吉安市2020-2021学年九年级上学期期中数学试题(已下线)练习18 相似综合练习-2020-2021学年【补习教材·寒假作业】九年级数学(苏科版)
名校
解题方法
6 . 【操作】如图①,在矩形
中,
为对角线
上一点(不与点
重合),将
沿射线
方向平移到
的位置,
的对应点为
.已知
(不需要证明).
【探究】过图①中的点
作
交
延长线于点
,连接
,其它条件不变,如图②.求证:
.
【拓展】将图②中的
沿
翻折得到
,连接
,其它条件不变,如图③.当
最短时,若
,
,直接写出
的长和此时四边形
的周长.
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f460edcced5597615113c0fdc95b1dfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a00d05c60999eff91345a545fb57e9af.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/11e34344c98cef5cd12809278ade085c.png)
【探究】过图①中的点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51db93dcdc7f70db8eba5c68cc42a26a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319a01218514917e446dfc807a625ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/095ea4e46c7be7e93751c418dffc28d6.png)
【拓展】将图②中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a00d05c60999eff91345a545fb57e9af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/600b750d39c8b79e9502a45e73c874da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5f7ee64ca8e05546e297ddfc695d57d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5f7ee64ca8e05546e297ddfc695d57d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88c91725cdcd86f28060277a45dd5285.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3351990ec75445cc87ff63196183bb2a.png)
![](https://img.xkw.com/dksih/QBM/2020/5/5/2456242036965376/2456804739031040/STEM/d0a14438-e8cf-43fb-8e50-5b03872ba28e.png)
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7 . 阅读下列材料,完成相应的任务
任务:
(1)类比探究:对于函数y=![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea9c344bd1c99f5e29a7f05cfa929796.png)
,当x= 时,y有最小值,最小值为 .
(2)应用拓展:如图③,若点D在BC上运动,AD⊥BC,AD=3,BC=5.连接AB,AC.求△ABC周长的最小值.
数学活动课上,老师提出如下问题: 如图①,在四边形ABCD中,AB⊥BC,DC⊥BC,AB=2,DC=4,BC=8,点P为BC边上的动点,求当BP的值是多少时,AP+DP有最小值,最小值是多少. 小丽和小明对老师提出的问题进行了合作探究: 小丽:设BP=x,则CP=8﹣x,根据勾股定理,可得AP+DP= ![]() ![]() 小明:利用轴对称作图,如图②,作点A关于直线BC的对称点A′,连接A′D,与BC交于点P,根据两点之间线段最短,将求AP+DP的最小值转化为求线段A'D的长. 由△A′BP∽△DCP,得 ![]() ![]() ![]() 所以BP= ![]() 过点A′作A′H⊥DC,交DC的延长线于点H,再由勾股定理,可得A′D= ![]() ![]() 所以当BP= ![]() ![]() |
(1)类比探究:对于函数y=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea9c344bd1c99f5e29a7f05cfa929796.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45bcd8f6ede8cc2513ad41402f40086.png)
(2)应用拓展:如图③,若点D在BC上运动,AD⊥BC,AD=3,BC=5.连接AB,AC.求△ABC周长的最小值.
![](https://img.xkw.com/dksih/QBM/2020/4/11/2439073887592448/2440164187193344/STEM/04802f3d65374712a55577f58a3296d1.png?resizew=184)
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2020-04-12更新
|
154次组卷
|
2卷引用:2020年吉林省长春市中考数学评价检测试题(二)
名校
8 . 问题情境:在
中,
,点
是
的中点,以
为角的顶点作
.
感知易证:(1)如图1,当射线
经过点
时,
交边
于点
.将
从图1中的位置开始,绕点
按逆时针方向旋转,使射线
、
始终分别交边
,
于点
、
,如图2所示,易证
,则有
.
操作探究:(2)如图2,
与
是否相似,若相似,请证明;若不相似,请说明理由;
拓展应用:(3)若
,直接写出当(2)中的旋转角为多少度时,
与
相似.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1563b386f79fc8ca64ad744eff21998.png)
感知易证:(1)如图1,当射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a54e7b35c73ee578c4d01479ddb74cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/3d197d256d08e323a48d36c14fa24698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0a2c04398112c63d9620f607bedb474.png)
操作探究:(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3634979dfcebf857b20874dd320d80b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8129a90e6874cdc7c23ca4784aa9da8a.png)
拓展应用:(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11cf7a72a847385a45fd20a8c53cf004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3634979dfcebf857b20874dd320d80b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://img.xkw.com/dksih/QBM/2020/4/10/2438680395857920/2439120809811968/STEM/6e0dd2370638493a99fe73f789027510.png?resizew=402)
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名校
9 . 感知:如图①,在四边形ABCD中,AB∥CD,∠B=90°,点P在BC边上,当∠APD=90°时,可知△ABP∽△PCD.(不要求证明)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/1/20e2725f-92d9-42e5-9487-8f8bff7c1a04.png?resizew=448)
探究:如图②,在四边形ABCD中,点P在BC边上,当∠B=∠C=∠APD时,求证:△ABP∽△PCD.
拓展:如图③,在△ABC中,点P是边BC的中点,点D、E分别在边AB、AC上.若∠B=∠C=∠DPE=45°,BC=6
,BD=4,则DE的长为 .
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/1/20e2725f-92d9-42e5-9487-8f8bff7c1a04.png?resizew=448)
探究:如图②,在四边形ABCD中,点P在BC边上,当∠B=∠C=∠APD时,求证:△ABP∽△PCD.
拓展:如图③,在△ABC中,点P是边BC的中点,点D、E分别在边AB、AC上.若∠B=∠C=∠DPE=45°,BC=6
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
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2019-10-08更新
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15卷引用:吉林省长春市五校2018届九年级上学期第二次月考(期中)数学试题
吉林省长春市五校2018届九年级上学期第二次月考(期中)数学试题吉林省长春市五校2018届九年级(上)期中数学试卷2018-2019学年吉林省长春市二道区九年级(上)第一次段考数学试卷【校级联考】吉林省长春市榆树市2018届九年级(上)期末数学试卷【区级联考】吉林省长春市铁南片区2019届九年级(上)期中数学试卷吉林省长春市铁南片2019-2020学年华东师大版九年级(上)第一次月考数学试卷 2017-2018学年福建省漳州市龙海二中九年级(上)期中数学试卷【区级联考】江苏省无锡市锡山区2019届九年级(下)第一次段测数学试卷【区级联考】四川省成都市金牛区2019年中考一模数学试题【校级联考】河南省南阳市新野县2019届九年级上学期期中质量调研数学试题2019年河南省许昌市实验中学中考一模数学试题河南省周口市淮阳区2019-2020学年九年级上学期期末数学试题(已下线)相似三角形模型(已下线)专题27.36 相似三角形几何模型-一线三等角(专项练习)-2021-2022学年九年级数学下册基础知识专项讲练(人教版)山东省济宁市曲阜市曲阜夫子学校2022-2023学年九年级上学期期末数学试题
名校
解题方法
10 . 【问题探究】课堂上老师提出了这样的问题:“如图①,在
中,
,点
是
边上的一点,
,求
的长”.某同学做了如下的思考:如图②,过点
作
,交
的延长线于点
,进而求解,请回答下列问题:
(1)
___________度;
(2)求
的长.
【拓展应用】如图③,在四边形
中,
,对角线
相交于点
,且
,
,则
的长为_____________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2677ee9264fd2b6338e4ed853c91e320.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/78fbeaaa52a05a25af4e4a732be7b069.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2fc80dcef4a107f2b563e9691ad71c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcfbc2a377c4d6c0423744c3b63409b6.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
【拓展应用】如图③,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1186fe53485ea2e89383ee6c697bd742.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d578394cd8e4d7a705599269c512960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/822ba132ca9dd0d4a050659aef3c9b26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61a51d820b444fbc8e09583ba8a4b4a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2020/4/24/2448419864641536/2449790856601600/STEM/30a7c67010e84f02a195cd715d9951ea.png?resizew=168)
![](https://img.xkw.com/dksih/QBM/2020/4/24/2448419864641536/2449790856601600/STEM/d3bdaa8e6ac944ebad0d55817686c234.png?resizew=162)
![](https://img.xkw.com/dksih/QBM/2020/4/24/2448419864641536/2449790856601600/STEM/9ec44634cb5f48049c62adfe2fbaff5f.png?resizew=148)
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2020-04-26更新
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4卷引用:吉林省东北师范大学附属中学2018-2019学年九年级第二次综合测试数学试题