如图,在矩形ABCD中,AB=8,BC=10,点M是BC边上的动点,点M从点B出发,运动到点C停止,N是CD边上一动点,在运动过程中,始终保持AM⊥MN,设BM=x,CN=y.
![](https://img.xkw.com/dksih/QBM/2021/12/28/2889497959759872/2946674140618752/STEM/cc175554-3605-495c-a264-d74d845ac6e1.png?resizew=189)
(1)直接写出y与x的函数关系式,并写出自变量x的取值范围______;
(2)先完善表格,然后在平面直角坐标系中利用描点法画出此抛物线.直接写出m=______,
![](https://img.xkw.com/dksih/QBM/2021/12/28/2889497959759872/2946674140618752/STEM/98c0ae47-4478-4579-8b7a-1780896dca17.png?resizew=365)
(3)结合图象,指出M、N在运动过程中,当CN达到最大值时,BM的值是______;并写出在整个运动过程中,点N运动的总路程______.
![](https://img.xkw.com/dksih/QBM/2021/12/28/2889497959759872/2946674140618752/STEM/cc175554-3605-495c-a264-d74d845ac6e1.png?resizew=189)
(1)直接写出y与x的函数关系式,并写出自变量x的取值范围______;
(2)先完善表格,然后在平面直角坐标系中利用描点法画出此抛物线.直接写出m=______,
x | ... | 2 | 3 | 4 | 5 | 6 | 7 | 8 | ... |
y | .... | 2 | ![]() | 3 | m | 3 | ![]() | 2 | ... |
![](https://img.xkw.com/dksih/QBM/2021/12/28/2889497959759872/2946674140618752/STEM/98c0ae47-4478-4579-8b7a-1780896dca17.png?resizew=365)
(3)结合图象,指出M、N在运动过程中,当CN达到最大值时,BM的值是______;并写出在整个运动过程中,点N运动的总路程______.
21-22九年级上·河南南阳·期末 查看更多[6]
河南省邓州市2021-2022学年九年级上学期期末质量评估数学试题河南省南阳市邓州市2021-2022学年九年级上学期期末数学试题(已下线)专题13 一线三等角模型证相似-【微专题】2022-2023学年九年级数学下册常考点微专题提分精练(人教版)(已下线)专题21.5 实际问题与二次函数【十大题型】-2023-2024学年九年级数学上册举一反三系列(沪科版)(已下线)专题22.5 实际问题与二次函数【十大题型】-2023-2024学年九年级数学上册举一反三系列(人教版)(已下线)专题1.5 实际问题与二次函数【十大题型】-2023-2024学年九年级数学上册举一反三系列(浙教版)
更新时间:2022-03-29 14:46:47
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解答题-问答题
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【推荐1】如图,二次函数
的图像交x轴于A,
两点,交y轴于
.
(2)点M为这个二次函数图像上一个动点,点N为坐标平面上任意一点,设点M的横坐标为m,则点N的横坐标为
,且
轴.
①若点N也在二次函数的图像上,求m的值;
②当线段
与二次函数的图像有两个公共点时,请直接写出m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f36488f7dff759ace2a27e56c3857056.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edd81cac5d2bcf0753819951088027d1.png)
(2)点M为这个二次函数图像上一个动点,点N为坐标平面上任意一点,设点M的横坐标为m,则点N的横坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f5a8eac848f5075a0cdf46026e5bc40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5125f17b4e2eab992b9a17dea1e86c5d.png)
①若点N也在二次函数的图像上,求m的值;
②当线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
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【推荐2】如图,已知△
中,
,
,
边上的高
,直角梯形
的底
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边上,
,点
、
分别在边
、
上,且
∥
,
,垂足为
,设
的长为
,直角梯形
的面积为
,求
关于
的函数解析式,并写出函数的定义域;
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【推荐1】如图,把正方形纸片ABCD沿对边中点所在的直线对折后展开,折痕为MN,再过点B折叠纸片,使点A落在MN上的点F处,折痕为BE,若AB的长为2,求FM的长.
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【推荐2】我国古代数学家赵爽利用影子对物体进行测量的方法,至今仍有借鉴意义.如图1,身高
的小王晚上在路灯灯柱
下散步,他想通过测量自己的影长来估计路灯的高度,具体做法如下:先从路灯底部A向东走20步到M处,发现自己的影子端点落在点P处,作好记号后,继续沿刚才自己的影子走4步恰好到达点P处,此时影子的端点在点Q处,已知小王和灯柱的底端在同一水平线上,小王的步间距保持一致.
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(1)请在图中画出路灯O和影子端点Q的位置.
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的高,并求影长
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(3)无论点光源还是视线,其本质是相同的,日常生活中我们也可以直接利用视线解决问题.如图2,小明同学用自制的直角三角形纸板
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
(3)无论点光源还是视线,其本质是相同的,日常生活中我们也可以直接利用视线解决问题.如图2,小明同学用自制的直角三角形纸板
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解答题-证明题
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【推荐1】如图,矩形
中,
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交
于点
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(1)求证:
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(1)求证:
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(2)若
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【推荐2】如图,在平行四边形
中,对角线
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是矩形;
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的面积是
,且
,求对角线
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fca3734de79f7f50b552ef62b29dc7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)如四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cde029ac94c601540583c64bc48c17bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b2aabb3232e9ffabad9def25515cbdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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