名校
1 . 下列说法正确的是( )
A.过一点一定有一条直线与已知直线平行 | B.三点确定一个圆 |
C.一个三角形只有一个外接圆 | D.三角形的外心到三条边的距离相等 |
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2 . 如图,△ABC是等腰直角三角形,∠ACB=90°,AC=BC,点P是△ABC内一点,连接PA,PB,PC,已知∠1=30°,∠2=∠3.
(1)求证:AP=BC;
(2)试探究△PAB与△PBC的面积的比值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/5/9eeddcfe-984c-44b9-96f3-60b7e3d65a36.png?resizew=214)
(1)求证:AP=BC;
(2)试探究△PAB与△PBC的面积的比值.
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3 . 因式分解:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9caf05acbab37d2badde55289314c348.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9caf05acbab37d2badde55289314c348.png)
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4 . 已知二次函数
.
(1)如果二次函数的图象与
轴有两个公共点,求
的取值范围;
(2)如图,二次函数的图象过点
,与
轴交于点
,直线
与这个二次函数图象的对称轴交于点
,求
的面积;
(3)在(2)的条件下,根据图象直接写出使一次函数值小于二次函数值的
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa653894ff179b6f9f797239c74c3c7c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/16/7cef0093-af1f-4602-b49f-47bf9ade55e6.png?resizew=149)
(1)如果二次函数的图象与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)如图,二次函数的图象过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/241ce9bd28046ce9b90f43b391132884.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b4dcc093218443f71a046b6df94bbe.png)
(3)在(2)的条件下,根据图象直接写出使一次函数值小于二次函数值的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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名校
5 . 如图,直线
∥
,直线
分别交
,
于点
,
,
的平分线
交
于点
,
,则
( )
![](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/0f85fca60a11e1af2bf50138d0e3fe62.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e470b9b1ab6b8db7d19dc1e48ad6f09b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/317068b7feee03bb7c8c33bf9da81fe8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b09d8841cf886e752f7e1adcce8ff65.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/26/637ac529-7bfa-477b-bac2-2599f1f38f6e.png?resizew=191)
A.70° | B.110° | C.120° | D.140° |
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6 . 已知方程ax2+bx+c=0(a≠0)的两根分别为x1,x2.
(1)证明韦达定理:
;
(2)利用韦达定理解决问题:已知Rt△ABC中,斜边AB=5,AC,BC的长是关于x的方程x2-(2m-1)x+4(m-1)=0的两个根,AC<BC,以C为圆心,CA为直径画图,交AB于D,求AD的长.
(1)证明韦达定理:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/441c0bdabe888e5186df61100e1d9455.png)
(2)利用韦达定理解决问题:已知Rt△ABC中,斜边AB=5,AC,BC的长是关于x的方程x2-(2m-1)x+4(m-1)=0的两个根,AC<BC,以C为圆心,CA为直径画图,交AB于D,求AD的长.
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7 . 如图1,在平面直角坐标系中,直线
与抛物线
交于
、
两点,其中
,
.该抛物线与
轴交于点
,与
轴交于另一点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/26/74bdd37e-64ff-4c9b-83b0-0fed98d62114.png?resizew=464)
(1)求
、
的值及该抛物线的解析式;
(2)如图2.若点
为线段
上的一动点(不与
、
重合).分别以
、
为斜边,在直线
的同侧作等腰直角
和等腰直角
,连接
,试确定
面积最大时
点的坐标.
(3)如图3.连接
、
,在线段
上是否存在点
,使得以
、
、
为顶点的三角形与
相似,若存在,请直接写出点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e6e15daf7b14dbff32c390f4984dcfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d7a6fd6d651ae341154c2e40928d628.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/906948588ab8a93adbacfd6606495fd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/26/74bdd37e-64ff-4c9b-83b0-0fed98d62114.png?resizew=464)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)如图2.若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/784b26de6134b6d3f5a81e2882a7d7f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cfce6da93ad3e6053fe4d732f6e456b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3de0022a7f2e122492f1483e4d3cccba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)如图3.连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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8 . 某药店在今年6月份购进了一批口罩,这批口罩包括一次性医用外科口罩和N95口罩,且两种口罩的只数相同,其中一次性医用外科口罩花费1600元,N95口罩花费9600元.已知一次性医用外科口罩的单价比N95口罩的单价少10元,那么一次性医用外科口罩的单价为多少元?设一次性医用外科口罩单价为x元,则列方程正确的是( )
A.![]() | B.![]() |
C.![]() | D.![]() |
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2022-09-01更新
|
62次组卷
|
2卷引用:云南省大理市大理白族自治州民族中学2023-2024学年高一上学期开学数学试题
名校
9 . 计算:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a708c6da619e02dae4163360934bc2cd.png)
______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a708c6da619e02dae4163360934bc2cd.png)
您最近一年使用:0次
2021-10-17更新
|
89次组卷
|
2卷引用:云南省大理市大理白族自治州民族中学2023-2024学年高一上学期开学数学试题
10 . 已知
,观察并找规律,计算
的结果是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cf97e84debf6d2df3920d585a8930ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3689dc9626426d7e40a86be1523a4f.png)
A.42 | B.120 | C.210 | D.840 |
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