解题方法
1 . 如图,抛物线
和直线
在第一象限内的交点为
.设
是抛物线
上的动点,且满足
,记
.现有四个结论:①当
时,
;②当
时,
的最小值是
;③当
时,
的最小值是
;④无论
为何值,
都存在最小值.其中正确的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f32be681ecfdd5463567671d1ee034d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/692265c4b64c721bd3e567b8af832b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8198c3b302b3820e86763428eb1e91cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3463ced6030af957f13f9ba05b977c1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aed45b7bec73a62c63acee8b824c8f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72909a067582ac555dfcf5e740706c7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/731945ef62ee40072e0865bb171cebaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95080f998b4250d7ec84a678077aad74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f6bc5783d03fe4d024be0f084fb02f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99adbd4478d28e56305cfd636b0bc53b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ea366f1b3e38506c5aa54dbd9d2484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99adbd4478d28e56305cfd636b0bc53b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/5/fbde06cf-c77d-405f-a337-eab95a4b0704.png?resizew=187)
A.1 | B.2 | C.3 | D.4 |
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