已知:如图,在
和
中,
,
,
.求证:
.(验证HL)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7182761948491380a34a4e1994114dc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc5d46fff0ce63ed71465b3e9efca8d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e117b368e8495c7835e3878233068fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fef73d6628c3248ae8cbef464050ed2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db2f85c538f4c974a35d259a1f766dd6.png)
![](https://img.xkw.com/dksih/QBM/2021/10/12/2827617506803712/2828322666119168/STEM/26172d9a-92dc-40c5-8024-ece099b1df04.png)
20-21八年级下·全国·课后作业 查看更多[1]
(已下线)【人教版课时练习】八年级下册数学第17章 勾股定理17.1 勾股定理
更新时间:2021-10-13 09:40:06
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解答题-证明题
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【推荐1】如图,点
、
、
、
在同一直线上,
,
,
.则
与
有什么位置关系?证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a510a3eb906b3ef0760b0d1723d11ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c244edbf77fbb8e9c017515e370c5c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/2022/11/11/3107442173321216/3108922787307520/STEM/45b8546276094454af8f77674306fe77.png?resizew=123)
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【推荐1】如图一架25米长的梯子
斜靠在一面墙上,梯子底端B到墙底的垂直距离
为7米.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/2145391f-5272-45d2-9461-6bfe793e0e6f.png?resizew=105)
(1)求这个梯子的顶端A到地面的距离
的值;
(2)如果梯子的顶端A沿墙
竖直下滑4米到点D处,求梯子的底端B在水平方向滑动了多少米?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/2145391f-5272-45d2-9461-6bfe793e0e6f.png?resizew=105)
(1)求这个梯子的顶端A到地面的距离
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)如果梯子的顶端A沿墙
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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解答题-证明题
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【推荐2】如图,
于点
于点
与
交于点
,并连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/28/71952496-7366-4855-b865-6fcfe15eafcd.png?resizew=205)
(1)求证:
平分
.
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d320f180419175d75eebc618cc458b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e82bf95f610e913faf9bc00ab1928c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9289bfc49ba4165089dbede16813bbd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1e58563f64b399a31ca1b3a3707708b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/28/71952496-7366-4855-b865-6fcfe15eafcd.png?resizew=205)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2bff8008dea938bbebce181a2133fef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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