如图,一架云梯
斜靠在一竖直的墙
上,这时
米,云梯
的长度比
的长度(云梯底端离墙的距离)大10米,
,设
的长度为x米.
(1)求
的长度;
(2)若云梯的顶端A沿墙下滑了5米到达点C处,试判断云梯的底部B是否也外移了5米?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a495f269abecbc96bc900c310fd402c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8dcca60ba6144abbf47abd51d1f63f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/21/e1bf50e2-e3c5-4971-b5e5-47d41fad5a9a.png?resizew=146)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
(2)若云梯的顶端A沿墙下滑了5米到达点C处,试判断云梯的底部B是否也外移了5米?请说明理由.
更新时间:2023-10-20 16:10:03
|
【知识点】 求梯子滑落高度(勾股定理的应用)解读
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【推荐1】如图所示,一架梯子AB斜靠在墙面上,且AB的长为2.5米.
![](https://img.xkw.com/dksih/QBM/2019/12/11/2352905704914944/2353598456528896/STEM/3359a7eb7d7a4ab885a7e3e7b0a10687.png?resizew=157)
(1)若梯子底端离墙角的距离OB为0.7米,求这个梯子的顶端A距地面有多高?
(2)在(1)的条件下,如果梯子的顶端A下滑0.4米到点A′,那么梯子的底端B在水平方向滑动的距离BB′为多少米?
![](https://img.xkw.com/dksih/QBM/2019/12/11/2352905704914944/2353598456528896/STEM/3359a7eb7d7a4ab885a7e3e7b0a10687.png?resizew=157)
(1)若梯子底端离墙角的距离OB为0.7米,求这个梯子的顶端A距地面有多高?
(2)在(1)的条件下,如果梯子的顶端A下滑0.4米到点A′,那么梯子的底端B在水平方向滑动的距离BB′为多少米?
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【推荐2】一梯子
长
,如图那样斜靠在一面墙上,梯子底端到墙的距离
长
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/11aa08c0-8661-4376-9307-4712576c0b39.png?resizew=171)
(1)这架梯子的顶端离地面有多高?
(2)设梯子顶端到水平地面的距离为
,底端到垂直墙面的距离为
,若
,根据经验可知:当
时,梯子最稳定,使用时最安全.若梯子的顶端
下滑了
到
,梯子底端
滑动到
处,请问此时使用梯子是否安全.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8d017417b2d4097b1db19a6c51704fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cc3d63940836d7cfbb7d3eead8c3f9e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/11aa08c0-8661-4376-9307-4712576c0b39.png?resizew=171)
(1)这架梯子的顶端离地面有多高?
(2)设梯子顶端到水平地面的距离为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2603005c1b922e12c8e36134abe9180.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b6bf934bcc118b8e69434ab955e973.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0680b79054c12b0ca6b3359f525dbde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
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