1 . 在菱形ABCD中,对角线AC和BD相交于点O,OE为
中BC边上的高.若
的两条边长分别为8和6,则线段CE的长为_______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7ffcd1925a2b1259221c6a476152f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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2022-03-26更新
|
235次组卷
|
2卷引用:云南省文山壮族苗族自治州广南县2021-2022学年九年级上学期期末数学试题
2 . 如图,△ABC中,点D、E分别是AC、BC边的中点,若四边形ABED的面积为9 cm2,则△ABC的面积为________________ cm2.
![](https://img.xkw.com/dksih/QBM/2022/1/11/2892284438216704/2944591590309888/STEM/d3e4dd31-d824-4ce9-bda1-c0b664cf7ec2.png?resizew=175)
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3 . 如图,在△ABC中,cos∠BAC=
,AB=26,AC=15,BD⊥AC,垂足为D,E是BD的中点,AE与BC交于点F.
![](https://img.xkw.com/dksih/QBM/2022/2/25/2924002099052544/2927512626364416/STEM/07b9854e-f113-4eee-86ad-1eedd4a45774.png?resizew=193)
(1)求∠CBD的正切值;
(2)求
的值,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5756451881af4d6594c820652ebcc2a.png)
![](https://img.xkw.com/dksih/QBM/2022/2/25/2924002099052544/2927512626364416/STEM/07b9854e-f113-4eee-86ad-1eedd4a45774.png?resizew=193)
(1)求∠CBD的正切值;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd01a4cbd347fce1a7414eb9fa73d16.png)
您最近一年使用:0次
2022-03-02更新
|
300次组卷
|
3卷引用:云南省楚雄彝族自治州2021-2022学年九年级上学期期末数学试题
4 . 抛物线y=x2+bx+c与x轴交于A、B两点,与y轴交于点C,点A的坐标为(﹣1,0),点C的坐标为(0,﹣3).点P为抛物线y=x2+bx+c上的一个动点.过点P作PD⊥x轴于点D,交直线BC于点E.
(1)求b、c的值;
(2)设点F在抛物线y=x2+bx+c的对称轴上,当△ACF的周长最小时,直接写出点F的坐标;
(3)在第一象限,是否存在点P,使点P到直线BC的距离是点D到直线BC的距离的5倍?若存在,求出点P所有的坐标;若不存在,请说明理由.
(1)求b、c的值;
(2)设点F在抛物线y=x2+bx+c的对称轴上,当△ACF的周长最小时,直接写出点F的坐标;
(3)在第一象限,是否存在点P,使点P到直线BC的距离是点D到直线BC的距离的5倍?若存在,求出点P所有的坐标;若不存在,请说明理由.
您最近一年使用:0次
2022-02-23更新
|
337次组卷
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4卷引用:云南省文山壮族苗族自治州2021-2022学年九年级上学期期末数学试题
名校
5 . 如图,在矩形
中,对角线
的垂直平分线与边
、
分别交于点
、
,连结
、
.
![](https://img.xkw.com/dksih/QBM/2022/1/8/2896974573199360/2901960031870976/STEM/8e59c512-46d9-4918-88a3-6917b438f8d9.png?resizew=181)
(1)试判断四边形
的形状,并说明理由;
(2)若
,
,求
的长;
(3)连结
,若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/2022/1/8/2896974573199360/2901960031870976/STEM/8e59c512-46d9-4918-88a3-6917b438f8d9.png?resizew=181)
(1)试判断四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9766e5eb6796dafc5ffe212afdfc43c0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa93c521f05187b87f910b73e8140b58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(3)连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31b2cc1d0bfd22c88286880b9da1f6f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4d4b4f508b7ab4e842831777d5f68a8.png)
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名校
6 . 如图,在菱形ABCD中,点E在BC边上(与点B、C不重合),连接AE交BD于点G.
,
,
,求线段DG的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26ec09b87aa9c2d77d6d82863ed0ccd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f01c4faacedfe56f5127d6c0cc63cf.png)
![](https://img.xkw.com/dksih/QBM/2022/1/7/2896383404351488/2901451787837440/STEM/8719bac6-f826-4582-a27a-a1c65ee330c3.png?resizew=211)
您最近一年使用:0次
名校
7 . 如图,在
中,
,
,
,
,
的平分线BD交AC于点E,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32217457c4e96e2ef155cf15c1b65d97.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16aad38b43462ca7a8fb9bc9484ad3a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32217457c4e96e2ef155cf15c1b65d97.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/9cd71513-8c23-4b24-89cb-a0bef6f63846.png?resizew=148)
您最近一年使用:0次
2022-01-24更新
|
197次组卷
|
2卷引用:云南省云南大学附属中学2021-2022学年九年级上学期期末数学试题
8 . 如图,已知AB是⊙O的直径,
,连接OC,弦
,直线CD交BA的延长线于点
.
![](https://img.xkw.com/dksih/QBM/2022/1/14/2894333970972672/2895592292507648/STEM/7bf836c0-7231-4254-b6fa-c48728e90aa2.png?resizew=210)
(1)求证:直线CD是⊙O的切线;
(2)若
,
,求OC的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8af620f6d204d310d8e3f267fdd6c3f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9204fa555e4c2945323c6c49116ccfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2022/1/14/2894333970972672/2895592292507648/STEM/7bf836c0-7231-4254-b6fa-c48728e90aa2.png?resizew=210)
(1)求证:直线CD是⊙O的切线;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c99c8f21a487e6210511ce6dfe6a1a4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f26ad70d2b3aac8604834d57dfc59bb2.png)
您最近一年使用:0次
2022-01-16更新
|
190次组卷
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2卷引用:云南省文山壮族苗族自治州砚山县2021-2022学年九年级上学期期末数学试题
9 .
和
中,
,
的周长为
,则
的周长为________
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b96715995549e5e48494101570bb3bb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9417726f01db3895dd21a4530f8afbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b96715995549e5e48494101570bb3bb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb26c5cdef6f16f4b39cd091041b439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
您最近一年使用:0次
2022-01-16更新
|
109次组卷
|
2卷引用:云南省文山壮族苗族自治州砚山县2021-2022学年九年级上学期期末数学试题
名校
10 . 已知:如图,在
中,CD是斜边AB上的高
![](https://img.xkw.com/dksih/QBM/2021/9/13/2807123984146432/2810069859500032/STEM/c1bb46b0-480a-4375-a450-e8ad563a75e9.png)
(1)求证:
;
(2)若
,
,求AC的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://img.xkw.com/dksih/QBM/2021/9/13/2807123984146432/2810069859500032/STEM/c1bb46b0-480a-4375-a450-e8ad563a75e9.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1731e7adb9e3fd4cc15f7f8a9fe3f320.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d1e7f5a2a4b85244fe9dc569009cf9c.png)
您最近一年使用:0次