1 . 下列命题是假命题的是( )
A.所有的实数都可用数轴上的点表示 | B.三角形的一个外角等于内角的和 |
C.0是绝对值最小的有理数 | D.等角的补角相等 |
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2 .
的补角为
,则它的角度为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93f2e07c7d33985d4b447f87cabe16cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94a1801e2e7adce276c3ebf5a773ef0e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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3 . 若
,则
的补角为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dab8bc0ecfdc2c7f65392893539f5273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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2024-05-04更新
|
60次组卷
|
2卷引用:江西省九江市2023-2024学年七年级下学期期中数学试题
4 . 如图,将长方形
沿
翻折,使得点D落在
边上的点G处,点C落在点H处,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cc310194575262fb45352c2fbc19868.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9b44c440ef14a0a92ccbeb541d29ece.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cc310194575262fb45352c2fbc19868.png)
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5 . 若
,则它的补角![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
______
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c3975d0e87ea5028d37444dca76b331.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
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名校
6 . 如果一个角是
,那么它的补角的度数是______
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d36581140ebac5d28438ea63b1b23b65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
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7 . 若
,则
的补角的度数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f975d977ec660343b5f9db180158d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780d8fd6c6c1deeeb45e15f639719e02.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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8 . 如图,已知
,
,垂足分别为点G、D,
.
,则
______°;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaa106172cc7b3db22ebbcbc1fe84c04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3575fac382d25eef71830315b2481037.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/003664f97a516cca542fd6d82238410f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee2ef38925946da1145a68651da67da9.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
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2024-04-27更新
|
31次组卷
|
2卷引用:广东省韶关市翁源县2023-2024学年七年级下学期期中数学试题
9 . 图
是光伏发电场景,其示意图如图
,
为吸热塔,
处各安装定日镜(介绍见图
).绕各中心点(
,
),使过中心点的太阳光线经镜面反射后到达吸热器点
处.现测得
,
(提示:三角形的内角和为
).
(1)若过点
作
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46475980248ce4710813449a3533429a.png)
________ .
(2)设
,
,则
与
的数量关系是 _________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c110d865b032b2def2aa61780563ed4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c819512dd571775bceed3e3c8695d758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
图1 | 图2 | 图3 |
| | 定日镜由支架、平面镇等组成,支架与镜面交点为中心点,支架与地平行线垂直. |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/660f1957af9e41714cef8a14ba18e8ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46475980248ce4710813449a3533429a.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a978e57e8d08ca663f9ee2ca41184b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4b02dcf82b60df7d0a96837c9fc1313.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
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10 . 【图形感知】
如图1,
,点
在直线
上,点
在直线
上,点
为
、
之间一点.
,它可以通过如下方法证明,请你帮忙完成该结论的推理过程.
证明:如图①,过点
作
,
∵
,
(已知),
∴
_________(平行于同一条直线的两条直线平行),
∴
,
,
∴
(等式性质)
∴
.
(2)如图3,该基本图形称为“
型”(实线部分),仿照上面结论的推理思路可得
、
、
之间的关系是________;
(3)如图4,直线
,点
,
在直线
上,点
,
在直线
上,直线
,
分别平分
,
,且交于点
.猜想并证明
与
的数量关系.
(4)如图5,已知
,
与
两个角的角平分线相交于点
.
若
,
,设
,
________
.(用含有
,
的代数式表示)
如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/198718d123eb1f8f988d2e04b01dfe55.png)
证明:如图①,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00604947c63f9a8820c17ed3119827d5.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00604947c63f9a8820c17ed3119827d5.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b1a378a3a4660eb1ece52085a9b44d5.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de96d1491567868c54a5fd276489deed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08294498984a4056300001478610df24.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8725ac7692814a340c81577f19777b76.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/198718d123eb1f8f988d2e04b01dfe55.png)
(2)如图3,该基本图形称为“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29bcdd8c05cd04f46c6f4ba8aa3cb1d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a9b4a78c3b85dafdaec2e4e6dc87bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/431bd1ab475f5c7936a3b45b317abe99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfa70e7c9ef8b856b494d370b7d76482.png)
(3)如图4,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8a4352562ae8aa968014fd0d931b677.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/246a86f34603eaf2e6a948681b831b0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/936f5f26aac7197d42a41081fb1fda0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90026b96116424a245b335b1adb886b.png)
(4)如图5,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eefb9a7a779b6c8d21187ee751c420a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9444b698d7c072a1bc3d46485cb2f92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c86fc02d6dd49a04ad18240e24e91d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30f982ff032e9e6a117987301c1ed1a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37e71b29260539127707d057749325e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd00540dba9c02cf78f01abd08db7cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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