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1 . 先化简,再求值:
,其中
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/308ac93baab37dd4d95c4866cd3df2b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/639c3d2ff5ee566fcc1b69c65712a661.png)
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2 . 计算:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1dc7e3ccd1257b3a60a6e79ee40009a.png)
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3 . 若
是方程
的两个实数根,试求下列各式的值:
(1)
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b8897d3d434c9f4ac60eaf8ca0f406c.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c847f857b8d1788d4ba414b82840ef5e.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc6abf3f9b0ebcdc47a028c781b7edb9.png)
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4 . (1)化简:
;
(2)求方程
的解集.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef937ff3d3939ec00c2ccb3ad9a13848.png)
(2)求方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67bd4a53ea5aef1fb7aeabddbf4adb64.png)
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解题方法
5 . 如图1,点
、点
在直线
上,反比例函数
(
)的图象经过点
.
和
的值;
(2)将线段
向右平移
个单位长度(
),得到对应线段
,连接
,
.
①如图2,当
时,过点
作
轴于点
,交反比例函数图象于点
,求
的值;
②连接
,在线段
运动过程中,
能否是等腰三角形,若能,求出所有满足条件的
的值,若不能,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0ac2a8a5a6349dd33ea90832d168f79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/066ab4b2164401859482651f5aacf2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5de0d508ab8a1cc3b503ac310d49cf06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)将线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
①如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65397f11ea8af736f38debadf420c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/010989c488d7f0551c9f2aa8bba6bf1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/810f9b4c1535bf75de1e31c164ccfe1e.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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6 . 抛物线
与x轴交于A,B两点,与y轴交于点C,点P为抛物线上一动点,过点P作PQ平行BC交抛物线于点Q,P,Q两点间距离为m.
(2)取线段BC中点M,连接PM,当m最小时,判断以点P,O,M,B为顶点的四边形是什么四边形;
(3)设N为y轴上一点,在(2)的基础上,当
时,求点N的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb9ca095c086211e4b676d3a948d046a.png)
(2)取线段BC中点M,连接PM,当m最小时,判断以点P,O,M,B为顶点的四边形是什么四边形;
(3)设N为y轴上一点,在(2)的基础上,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b1a52ee810c2c090f61e8d4e1e788d7.png)
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7 . 如图,在矩形ABCD中,点A在双曲线
上,点B,C在x轴上,延长CD至点E,使
,连接BE交y轴于点F,连接CF,则
的面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f4c80dcb55ad32da4e5c16067f17d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e750ae795826d3e6388ca6c5c2bf9a0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eff00441c41fc516c37876d266fcbc6.png)
A.6 | B.7 | C.8 | D.9 |
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8 . 某风景管理区为提高游客到某景点的安全性,决定将到达该景点的步行台阶进行改善,如图把步行台阶由坡角45°改为坡角30°,已知原台阶坡面AB的长为5m,BC所在地面为水平面.结果精确到0.1.(参考数据:
,
)
(2)改后的台阶多占了多长一段水平地面?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c894b7d6baa55c80c64e74748dad898.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/460317e7c26f95b9b29cfe1a89b796d6.png)
(2)改后的台阶多占了多长一段水平地面?
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9 . 如图,
是
的外接圆,点D在劣弧
上,点E在弦AB上(点E不与点A重合),且四边形BDCE为菱形.
;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0105d0889f6fa9cb5430cf9e09337173.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b524bea14ef9398d1f275d6ce139d7.png)
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10 . 如图,
,E是线段AB上一点,且
,
.
;
(2)若
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41aba1711910c6f533cc94319104f4fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2291de85a2a29ff360a4515cce99c804.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/181a87e1244f3986865ed5803c8f2a91.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/640f058b479299659893cf524ddf6544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2689f0ce5ab3467d8214794d8acb2bd6.png)
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