如图,在Rt△ABC中,∠C=90°,AD平分∠CAB,CD=1.5,BD=2.5,求AC的长.
![](https://img.xkw.com/dksih/QBM/2019/1/17/2120662440730624/2121549768187904/STEM/c5daeed6c43d4550b5aa81ab66dfc6be.png?resizew=153)
17-18八年级下·全国·期中 查看更多[3]
(已下线)期中综合测评卷-2018年八年级下册数学名师学案(北师大版)【市级联考】吉林省德惠市2018-2019学年八年级上学期期末学业水平监测数学试题黑龙江大庆市万宝学校2018-2019学年七年级(五四制)上学期期末考试数学试题
更新时间:2018-12-23 11:06:08
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【推荐1】如图,OB⊥OD,OC平分∠AOD,∠BOC=35°,求∠AOD和∠AOB的大小.
![](https://img.xkw.com/dksih/QBM/2022/1/3/2886268040347648/2887007152537600/STEM/8a7d3e02-abaa-4bd1-9000-7b352ba2e101.png?resizew=212)
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【推荐2】如图,已知
、
、
三点在同条直线上,
、
分别平分
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/11/fe8dd070-61bc-43f0-ab2a-37bc21e896b7.png?resizew=139)
(1)若
,求
的度数;
(2)若
,求
的度数;
(3)图中是否有互补的角?若有请写出所有互补的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/11/fe8dd070-61bc-43f0-ab2a-37bc21e896b7.png?resizew=139)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2c55b474190350c810da30a56035644.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7307ac7510cf35f74337d368b94da4e5.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d07b91ffd87cff52c97df6114c3a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbee6d5731d6f4bb1e4f2ba3d89b7dc.png)
(3)图中是否有互补的角?若有请写出所有互补的角.
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【推荐2】如图所示,四边形
的对角线
,
相交于点
,
,
.求证:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/074e6a45-80de-4fa6-81cc-156259466d4b.png?resizew=188)
(1)
≌
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fca3734de79f7f50b552ef62b29dc7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33cbad6599796efc1c177ae9349feda9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/074e6a45-80de-4fa6-81cc-156259466d4b.png?resizew=188)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/372629a8666de1e9bac3e7daadcac7b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7ffcd1925a2b1259221c6a476152f7.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
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