如图,在平面直角坐标系中,点A、B的坐标分别为(﹣3,3)、(3,5),欲在x轴上找一点P,使PA+PB最短,小白试了四个点(﹣3,0)、(
,0)、(0,0)、(3,0).你认为点P的坐标应该为__ ,PA+PB的最小值为__ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d78fd95f89dec2d373fa57f02acd739f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/18/5c5768ee-c3ec-429e-9da6-f8332564cc9e.png?resizew=138)
更新时间:2021-08-09 16:20:18
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【推荐1】已知y是关于x的一次函数,当x=0时,y=-1;当x=-1时,y=-2.y关于x的函数表达式为 _____________ .
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【推荐2】如图,把3个小正方形放到平面直角坐标系中,每个小正方形的边长都是1个单位长度,经过
的一条直线l将这个图案分成面积相等的两部分,则该直线l的函数关系式为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8950c7bc835103d52ceffab14b6b31a.png)
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【推荐1】如图,正方形ABCD的边长为3,点E在边AB上,且
.若点P在对角线BD上移动,则
的最小值是 _________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adc90c2d45477e166b02359525f40aa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1172ff1d1010a9a76e1482b0b86b201d.png)
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【推荐2】已知
是等边三角形,点D在射线BC上(与点B,C不重合),点D关于直线
的对称点为点E.
![](https://img.xkw.com/dksih/QBM/2022/3/11/2934073148153856/2935917917249536/STEM/4ff50685-9a85-440d-9163-e5aa7e16075e.png?resizew=174)
![](https://img.xkw.com/dksih/QBM/2022/3/11/2934073148153856/2935917917249536/STEM/cd423bf4-bb05-43a0-8647-6ad09fb0a17b.png?resizew=180)
(1)如图1,连接
,
,
,当
时,根据边的关系,可判定
的形状是___________ 三角形;
(2)如图2,当点D在
延长线上时,连接
,
,
,
,延长
到点G,使
,连接
,交
于点F,F为
的中点.若
,则
的长为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://img.xkw.com/dksih/QBM/2022/3/11/2934073148153856/2935917917249536/STEM/4ff50685-9a85-440d-9163-e5aa7e16075e.png?resizew=174)
![](https://img.xkw.com/dksih/QBM/2022/3/11/2934073148153856/2935917917249536/STEM/cd423bf4-bb05-43a0-8647-6ad09fb0a17b.png?resizew=180)
(1)如图1,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a8e2c765175f2a5f4306fd3f3368647.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
(2)如图2,当点D在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32a2eb54b37ae312ba6c7767e806739f.png)
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