如果三角形的两个内角与
满足
,那么我们称这样的三角形为“准直角三角形”.
(1)关于“准直角三角形”,下列说法:
①在中,若
,
,
,则
是准直角三角形;
②若是“准直角三角形”,
,
,则
;
③“准直角三角形”一定是针角三角形.
其中,正确的是_________.(填写所有正确结论的序号)
(2)如图①,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
(3)如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2e30ffe627436f57ecf46b89c57bb21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
更新时间:2024-03-21 08:27:58
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图1,直线
,直线
与直线
分别相交于点E,F,在射线
上取点G,连结
,作
的平分线
,过点E作
.
(1)如图1,若
,
,判断直线
与直线
是否平行,并说明理由;
(2)如图2,是否存在点G,使得
平分
?若存在,请写出
与
之间的数量关系;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdcf86f7cf381c563ad80af86feeed83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68c6ee5e9d1b0396d2a6b1393be4167d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3096fc682ce884fd59269e3ca548b9cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/9/52b46296-00e3-4e9b-bcc4-c9edb5aeb4eb.jpg?resizew=319)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4bb177b4051b4c2148da79dc18a1a95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a2dec17206732316de6361c43f54bc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(2)如图2,是否存在点G,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e90b61b597057c8d4a99714d79e119e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73f68e4414c9ab464bf433385c03705f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4b31182bd71271d1e72d4b38c52f0cd.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】
中,
,点D是直线
上一个动点,点E是射线
上的点,
,设
,
.
(1)如图(2)当D线段
上,E在线段
上,
,
,则
______,
______;
(2)如图(1)当D在线段
上,E在线段
上求x和y之间的关系式;
(3)当点D在直线
上,点E在射线
上,(2)中x和y之间的关系还成立吗?说明你的理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f13be03c1a7cbd8b9c8ebbfd914b1d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27b7332625b3bd2a477ab21ab9ba00bd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/24/e512ce4a-b299-4458-9c25-975618985d3d.png?resizew=443)
(1)如图(2)当D线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ecbc3a6fd6ae27c377842f2a6b67540.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070d1ea22a92808dad7489438c239629.png)
(2)如图(1)当D在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(3)当点D在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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解答题-问答题
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适中
(0.65)
名校
【推荐1】在锐角三角形ABC中,∠C=2∠B,求∠B的取值范围
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】已知:如图①,在
和
中,
,
,
,AC,BD相交于点P.
![](https://img.xkw.com/dksih/QBM/2021/10/13/2828524875923456/2830417074339840/STEM/f1a6dece-fa3c-4cb4-840a-d4d88aa83818.png)
(1)求证:①
;
②
.
(2)如图②,在
和
中,
,
,
,
,
相交于点P,AC与BD间有怎样的数量关系?
的度数为多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a9a6eeeebf3cff569578d7366b755aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fca3734de79f7f50b552ef62b29dc7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33cbad6599796efc1c177ae9349feda9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0785412ab2f3b729b9afbe47cf26e4b8.png)
![](https://img.xkw.com/dksih/QBM/2021/10/13/2828524875923456/2830417074339840/STEM/f1a6dece-fa3c-4cb4-840a-d4d88aa83818.png)
(1)求证:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de966c316db1013defc56372fcf814e.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9678acfdc9d297cc2468beda9bf3ea2.png)
(2)如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a9a6eeeebf3cff569578d7366b755aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fca3734de79f7f50b552ef62b29dc7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33cbad6599796efc1c177ae9349feda9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed2fd69563c02e29e32d752f055336bb.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/cb686e4f5e3938575bc547e849d5513f.png)
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