阅读与思考
如图1所示的是一座钢铁桥梁,为了计算其中一个三角形钢架的面积,小明想办法测量出三边的长度
米,
米,
米,如何求三角形
钢架的面积?下面是甲,乙两位同学的解题思路,分别根据甲、乙两位同学的解题思路求
的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/21/8b466f71-cc36-48be-a2e4-5b6792ca69ee.png?resizew=388)
(1)甲同学:我们知道,已知
的三边长a,b,c,设
,即p为
周长的一半,那么利用海伦公式
就可求出
的面积.
(2)乙同学:如图2,过点A作
于点D,设
米,然后用含x的代数式表示出
,根据勾股定理,利用
作为“桥梁”建立方程,利用勾股定理求出
的长,再计算
的面积.
如图1所示的是一座钢铁桥梁,为了计算其中一个三角形钢架的面积,小明想办法测量出三边的长度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d2692a5f5c30b8b2232d9eb5faaf6a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fc81df6989b8d50388bebc967571651.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca6ed76f07629adbf9f49b35134c0b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/21/8b466f71-cc36-48be-a2e4-5b6792ca69ee.png?resizew=388)
(1)甲同学:我们知道,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a822dd4e1d3859f55874669092697a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e35b7eae154f81e66d2191ef1142da5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)乙同学:如图2,过点A作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61c34eff4d793873d9e812d75d90fd10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
22-23九年级上·河南南阳·期末 查看更多[3]
河南省南阳市邓州市2022-2023学年九年级上学期期末数学试题(已下线)期中押题重难点检测卷(提高卷)(考试范围:第1-3章)-【帮课堂】2022-2023学年八年级数学下册同步精品讲义(浙教版)陕西省西安市莲湖区2022-2023学年九年级上学期期末数学试题
更新时间:2023-03-16 14:11:14
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解答题-问答题
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适中
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名校
【推荐1】设一个三角形的三边长分别为
,
,
,设
,则有下列面积公式:
(海伦公式),
(秦九韶公式).
(1)一个三角形的三边长分别为
,
,
,求这个三角形的面积;
(2)一个三角形的三边长分别为
,
,
,求这个三角形的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6134c8ef96ab7ccb71108184839e8c91.png)
(1)一个三角形的三边长分别为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b06e95b57b7a81cd81d05557a11fa92.png)
(2)一个三角形的三边长分别为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35361e76a7c85d1886728c8d0200b234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/619096595112f0340a43b756e114dd3d.png)
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解答题-计算题
|
适中
(0.65)
名校
【推荐2】解答下列问题:
(1)当
时,化简
.
(2)已知
,求
的立方根.
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/301605e86e5a5e61a65c91cd3dd8b77e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e486277e286a15b329a47fc11475b68c.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cf03581d2d479e1ee71d0136d1a73be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c676c8c368513124dd15ba5ddc59e5d.png)
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解答题-证明题
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适中
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【推荐1】已知
的两条直角边及斜边长分别为
,斜边上的高是
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求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
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求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02f325f5f37fee2f10d6a2ad03d2294.png)
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解答题-计算题
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适中
(0.65)
【推荐2】如图,在
中,
是
边上的高,
,
平分
交
于点E,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e702e136211878dce558e0457f15df63.png)
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解答题-作图题
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适中
(0.65)
名校
【推荐1】如图,在矩形
中,
,
.动点
从点
出发,沿折线
运动,当它到达点
时停止运动,设点
运动的路程为
,连接
,
.设三角形
的面积为
.
(1)请直接写出
与
的函数关系式,并注明
的取值范围,在
的取值范围内画出
的函数图象;
(2)根据函数图象,写出该函数的一条性质;
(3)根据函数图象,直接写出当
时
的值(结果保留一位小数,误差范围
).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
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(1)请直接写出
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(2)根据函数图象,写出该函数的一条性质;
(3)根据函数图象,直接写出当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8076b511e27939c629762296b8cfd08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cde0f1509ffdb32b9c90edc3facedd1.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】如图,在
中,
,点
分别在边
上,
平分
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/15/fc8ef1c8-1f04-4f13-9537-9ec9ec08abaa.png?resizew=161)
(1)求
的长;
(2)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15ee608882881caff2f1e223177424ac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/15/fc8ef1c8-1f04-4f13-9537-9ec9ec08abaa.png?resizew=161)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70606b1ac03c18dcba0e000f44dcda96.png)
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