如图1,在△ABC中, BD、CD分别平分∠ABC、∠ACB.
(1)若∠A=60°
①求∠D的度数;
②如图2,点M、N、Q分别在射线DB、DC、BC上,BE、CE分别平分∠MBC、∠BCN,BF、CF分别平分∠EBC,∠ECQ,求∠F的度数;
(2)在②的条件下,请直接写出∠F与∠A的数量关系.
(1)若∠A=60°
①求∠D的度数;
②如图2,点M、N、Q分别在射线DB、DC、BC上,BE、CE分别平分∠MBC、∠BCN,BF、CF分别平分∠EBC,∠ECQ,求∠F的度数;
(2)在②的条件下,请直接写出∠F与∠A的数量关系.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/25/bf0215b5-106e-49b4-89d3-058cffe2b5b5.png?resizew=178)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/25/9d76f792-b2b3-4a27-b1c1-9e3797226476.png?resizew=267)
图1 图2
更新时间:2020-11-07 20:16:50
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】小晓在进行三角形全等的探究时提出命题:
①“两边及其中一边上的中线对应相等的两个三角形全等”
②“两角及其中一角的平分线对应相等的两个三角形全等”
![](https://img.xkw.com/dksih/QBM/2022/1/21/2899229494632448/3026653899931648/STEM/078da836e0974c1fb2296f0c694e6a17.png?resizew=353)
![](https://img.xkw.com/dksih/QBM/2022/1/21/2899229494632448/3026653899931648/STEM/c9ded436fd3d4db196d486d659b92dab.png?resizew=357)
(1)以上命题是真命题的有________﹔(填序号)
(2)请选择一个真命题及与之匹配的图形,补充完整已知、求证,然后证明.
我选择的命题是:________,(填序号)
已知:如图________(填序号),
与
中,________;
求证:________;
证明:
①“两边及其中一边上的中线对应相等的两个三角形全等”
②“两角及其中一角的平分线对应相等的两个三角形全等”
![](https://img.xkw.com/dksih/QBM/2022/1/21/2899229494632448/3026653899931648/STEM/078da836e0974c1fb2296f0c694e6a17.png?resizew=353)
![](https://img.xkw.com/dksih/QBM/2022/1/21/2899229494632448/3026653899931648/STEM/c9ded436fd3d4db196d486d659b92dab.png?resizew=357)
(1)以上命题是真命题的有________﹔(填序号)
(2)请选择一个真命题及与之匹配的图形,补充完整已知、求证,然后证明.
我选择的命题是:________,(填序号)
已知:如图________(填序号),
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8ee6e1d480ece7117e1f87ebf4bbeea.png)
求证:________;
证明:
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,在
中,
为
边上的高,
的平分线交
于点
,交
于点
.若
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/089638464efc63ffd2ccc2070e16cabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c50139f281e4d1a6d1dcb4f4327d7b2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36719f1e764ee0e719b65c49fae84677.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/2/b9d83142-710d-43b0-8bf6-188b8c790622.png?resizew=133)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】在折纸活动中,小明制作了一张
纸片,点D、E分别在
上,将
沿着
折叠,点A落在点
处,记
为
,
为
.
在
内部时,试探求
,
与
的数量关系,并说明理由;
(2)如图2,当点
在
外部时,
,
与
又有怎样的数量关系呢?请写出猜想,并给予证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86cae7cc6665dc8edfb9060075b3afb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f81abfe0ef0df552a8a97d7345da3a67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/752ac41a4527a39a8fbe60ef84853d4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
(2)如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】已知将一块直角三角板DEF放置在
上,使得该三角板的两条直角边DE,DF恰好分别经过点B、C.
过点A作直线
,若
,求
的度数;
、CD能否分别平分
、
,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ee278ed485d3bbe39af452c02116c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1cce19e142739da0427c92222df8a80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1283d4e603521682fb55ffeec1dab2b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23c745ac118f39ef63062cc6c6952ec6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f10681704c4fccfd37664eaf34391dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b664f3a011a2f1f31c66a2635c5367c.png)
![](https://img.xkw.com/dksih/QBM/2018/8/19/2013918272684032/2015061492523008/STEM/dbb90c43159847e29fa03145b9eb2bbf.png?resizew=186)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图,在
中,
,
分别是
,
边上的高,在
上载取
,延长
至点
使
,连接
,
.
(1)求证:
;
(2)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/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe8bb808edb7f81fb3c14c8f3d7f0fad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73032c21673ec4f9d52452da366e7828.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/4/0bd7ff33-6510-40b6-a452-49affa52f73c.png?resizew=205)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0af831d8dd327f64c00f13ecd0e2625.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f9f70b2bf8747fb27c7ca1ae7cdea4.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图所示,
中,
,
于点E,
于点D,交
于F.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/e4ef7b02-6103-4706-aa89-68bea22fc739.png?resizew=190)
(1)若
,求
的度数;
(2)若点F是
的中点,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d276d0010fd458383ea3dd61415e1aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/e4ef7b02-6103-4706-aa89-68bea22fc739.png?resizew=190)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01a32a2f86df7f164c75c0021fd71b21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c962fe4f47732b8e6e83d17ff2b9af13.png)
(2)若点F是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db965bb166681d5e12eb8e8d7db3454d.png)
您最近一年使用:0次