1 . 如图1,在平面直角坐标系中,直线
分别交y轴、x轴于
、
两点,且a、b满足
.
(1)求A、B两点的坐标;
(2)如图1,过点B作直线
的垂线,在此垂线上截取线段
,使
,求点C的坐标;
(3)如图2,在(2)的条件下,
交y轴于点E,点F为x轴负半轴上一点,记
的面积为
,四边形
的面积为
,设点
,
.
①用含x的式子表示y;
②当
时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/296c31eaede57efe89ffb83f02ad4622.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5612d598e27ac2ce0ab89fb63538bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2aca500a32bcef45dc26207ce50a1f7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/17/45a0b602-3bc1-4046-b2fe-9f4268fe3be5.png?resizew=327)
(1)求A、B两点的坐标;
(2)如图1,过点B作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1be86349e06431647f8e359d9bd07700.png)
(3)如图2,在(2)的条件下,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb16f3adb0ad34f117383d0842c2ba2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc1a13dae5cf4297e78c3aea6d1f9579.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d98ac39fe097fc07038901cb79121ed0.png)
①用含x的式子表示y;
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c843d64467eecba838805b05b15a0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cec89552ab0a18f0d1345bc6d740782b.png)
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2 . 已知:△
是等腰直角三角形.
![](https://img.xkw.com/dksih/QBM/2022/7/21/3027409507966976/3027440583696384/STEM/1df21cb3697a4f44ab5ac26a8579bce1.png?resizew=519)
(1)若
且a、b满足
.则
___________,
___________;
(2)如图1,在(1)的条件下,过点A作直线
轴交y轴于点E,过点C作
于点D.
①求证:△
△
;
②直接写出A点坐标;
(3)如图2,过点A和点C分别作x轴和y轴的的平行线相交于点D,若
,试问
的比值是否不变,若不变,求出比值;若变化,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://img.xkw.com/dksih/QBM/2022/7/21/3027409507966976/3027440583696384/STEM/1df21cb3697a4f44ab5ac26a8579bce1.png?resizew=519)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/859dfe3f4a821097dce30d831558de23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0295734b80a4d0feb45bcee7e5e60f38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
(2)如图1,在(1)的条件下,过点A作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177e105d92d91009c555bd2672fb1119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87320eb4a1c31ad4ffc15ccb2855a6cf.png)
①求证:△
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/871524c0df32e851bff8ede7a04cdca3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5469318165ce841ae6d790b8cb4b343c.png)
②直接写出A点坐标;
(3)如图2,过点A和点C分别作x轴和y轴的的平行线相交于点D,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feb67f27bcda7681b19239a199b4c4d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/006d620a361071f5299ee2fc2f0d3051.png)
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