1 . 如图,在
中,
,将
在平面内绕点
旋转到
的位置,使
,则旋转角的度数为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/938cec097a488e0ac6400037435a016c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c021993da445858448d368df42554c8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267e07d4aa26bbb8ecf669b66b9fd643.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2 . 如果直线
不经过第二象限,那么
的取值范围是( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d41e16f7cff04620285cfbf51d39f528.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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3 . 将点
向右平移
个长度单位,再向上平移
个长度单位得到点
,则点
的坐标是( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55cf12ef91baae92651b39ace17aa030.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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4 . 如图,菱形
的对角线
、
相交于点
,
,
,
与
交于点
.
;
(2)若
,
,求菱形
的面积.
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cccde778c619848076ea8c11b0b13a12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab47a785e0687f42e885e11497b7e969.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.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/535360e184069813edae857a1a84e3ec.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa1b519e1c71e72fc08e9d8fc8271cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b74e2b6dae540571fdd509c4e966b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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5 . 如图,菱形
中,对角线
、
相交于点
,
为
边中点,菱形
的周长为
,则
的长等于( )
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/814397354c2ae1cb08e0271305970811.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4cd68cc82e90a5e2049a7ea3171b84.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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6 . 如图,
的边上有一点D,
交
于点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
,其中点F在
上;
(2)在(1)完成的图中,若
,试说明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0fb178e3295dec0eb43f1d7af8bae47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(2)在(1)完成的图中,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/326b13b88aea30be998da90d510139e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e932b4add3175358f15be0e1f7104e79.png)
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昨日更新
|
38次组卷
|
2卷引用:宁夏银川十中、十五中2023-2024学年七年级下学期期中数学试题
7 . 如图1.在
中,D、E分别为
的中点,连接
:
(1)请结合操作1或操作2的方法所得出的结论,我们可以得到三角形中位线定理,
.
【结论应用】
(2)如图2,四边形
中,对角线
相交于点O,四条边上的中点分别为E、F、G、H、依次连接
,得到四边形
.
为平行四边形;
②当
与
满足 时,四边形
是矩形,当
与
满足 时,四边形
是菱形.
③若
,
,
,求四边形
的面积.
【问题解决】
(3)如图3所示,在一个四边形
的草坪上修一条小路,其中点P和点Q分别为边
和边
的中点,且
,
,
,求小路
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0d54431bbb28ebd98db5c1dc6083a75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
操作1.将![]() ![]() ![]() 操作2.延长 ![]() ![]() ![]() 试探究 ![]() ![]() |
.
【结论应用】
(2)如图2,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d578394cd8e4d7a705599269c512960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/882b9b8fbc7bd82819a2223df1882a21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b74e2b6dae540571fdd509c4e966b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2020a8429f161b32300c5b7ab36f8c89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1eb76fe74cba30f7cbcde349ba80da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
【问题解决】
(3)如图3所示,在一个四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/df0f1e09abab770b21fac00007485d9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
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8 . 如图,如图,
为半圆O的直径,C,D为半圆弧的三等分点,若
,则阴影部分的面积为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
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9 . 校园消防关系到全校师生的生命安全.某校为加强学生的消防意识,开展了“消防安全知识”宣传活动,活动后举办了消防知识竞赛(百分制),并分别在七、八年级中各随机抽取10名学生的成绩进行了统计、整理与分析(成绩用x表示,共分为三个等级:合格
,良好
,优秀
),下面给出了部分信息:
10名七年级学生的成绩:83,84,84,88,89,89,95,95,95,98
10名八年级学生中“良好”等级包含的所有数据为:85,90,90,90,94
抽取的七、八年级学生成绩统计表
抽取的八年级10名学生的成绩扇形统计图
(1)填空:
________,
________,
________;
(2)该校七、八年级各有700名学生,估计该校七、八年级学生中“优秀”等级共有多少人?
(3)学校决定选取两名八年级成绩达到优秀的学生去参加比赛,其中有一名女生,请利用树状图或者表格求出参加比赛的人选恰好一男一女的概率是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2e274ebbc5301617aff314abf4dc9ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/754d8364fc264a6917bc20aa26ae96ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a15ce50e3ef62407d8668c353ed60bd0.png)
10名七年级学生的成绩:83,84,84,88,89,89,95,95,95,98
10名八年级学生中“良好”等级包含的所有数据为:85,90,90,90,94
抽取的七、八年级学生成绩统计表
年级 | 平均数 | 中位数 | 众数 | 方差 | “优秀”等级所占百分比 |
七年级 | 90 | 89 | a | 26.6 | ![]() |
八年级 | 90 | b | 90 | 30 | ![]() |
(1)填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
(2)该校七、八年级各有700名学生,估计该校七、八年级学生中“优秀”等级共有多少人?
(3)学校决定选取两名八年级成绩达到优秀的学生去参加比赛,其中有一名女生,请利用树状图或者表格求出参加比赛的人选恰好一男一女的概率是多少?
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10 . 如图①,在平面直角坐标系中,一块等腰直角三角板
的直角顶点A在y轴,坐标为
,另一顶点B坐标为
,已知二次函数
的图象经过B、C两点,现将一把直尺放置在直角坐标系中,使直尺的边
轴且经过点B,直尺沿x轴正方向平移,当
与y轴重合时运动停止.
(2)若运动过程中直尺的边
交三角板的边
于点M,交抛物线于点N,求线段
长度的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/633ca6abf0a23f7986facd5941edfe2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ee8c50793afd59e6ab4a2be5a877759.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/304f66b1313dbe9849dab5d3762073d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/548776b62e7a92e1b11f5aeaf4d52392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
(2)若运动过程中直尺的边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
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