1 . 抛物线y=ax2+bx+3(a≠0)与x轴交于点A(﹣3,0)和B(1,0),与y轴交于点C,顶点是点D.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/8/16596d56-2f26-4a72-91d0-8daba4148869.png?resizew=541)
(1)求抛物线解析式;
(2)连接AD,CD,BC,将△OBC沿着x轴以1个单位每秒的速度向左平移,对应点分别是O',B',C′,设S表示O'B'C'与四边形AOCD的重叠部分面积,求S与时间t的函数解析式;
(3)如图2,点M(m,n)为抛物线上的任意一点,过M向直线y
作垂线,垂足为E,点F为抛物线对称轴上的一点,当ME﹣MF恒等于
时,求F点的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/8/16596d56-2f26-4a72-91d0-8daba4148869.png?resizew=541)
(1)求抛物线解析式;
(2)连接AD,CD,BC,将△OBC沿着x轴以1个单位每秒的速度向左平移,对应点分别是O',B',C′,设S表示O'B'C'与四边形AOCD的重叠部分面积,求S与时间t的函数解析式;
(3)如图2,点M(m,n)为抛物线上的任意一点,过M向直线y
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/362a98ee409cc610746a36fec85d9aed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
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2 . 完成下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/eca626d7-10de-4462-a57a-6bae18518a41.png?resizew=749)
(1)如图甲,在△ABC中,AD⊥BC于点D,正方形PQMN的边QM在BC上,顶点P,N分别在AB,AC上,若BC=6,AD=4,求正方形PQMN的边长;
(2)如图乙,在△ABC中,在AB上任取一点P′,画正方形P′Q′M′N′,使Q′,M′在BC边上,N′在△ABC内,连接BN′并延长交AC于点N,画NM⊥BC于点M,画NP⊥NM交AB于点P,再画PQ⊥BC于点Q,得到四边形PQMN,证明四边形PQMN是正方形;
(3)在(2)中,把线段BN称为“波利亚线”.如图丙,在“波利亚线”BN上取一点O,使NO=NM,连接OM、ON,若tan∠NBM=
,试求∠MOQ的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/eca626d7-10de-4462-a57a-6bae18518a41.png?resizew=749)
(1)如图甲,在△ABC中,AD⊥BC于点D,正方形PQMN的边QM在BC上,顶点P,N分别在AB,AC上,若BC=6,AD=4,求正方形PQMN的边长;
(2)如图乙,在△ABC中,在AB上任取一点P′,画正方形P′Q′M′N′,使Q′,M′在BC边上,N′在△ABC内,连接BN′并延长交AC于点N,画NM⊥BC于点M,画NP⊥NM交AB于点P,再画PQ⊥BC于点Q,得到四边形PQMN,证明四边形PQMN是正方形;
(3)在(2)中,把线段BN称为“波利亚线”.如图丙,在“波利亚线”BN上取一点O,使NO=NM,连接OM、ON,若tan∠NBM=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
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3 . 如图,在⊙O中,
,BD交OC于点F,EB是⊙O的切线,交OA的延长线于点E,EF交OB于点G,连接BC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/25/1ef268bb-be9b-479e-b9db-492512b9c897.png?resizew=228)
(1)求证:△OBE
△OFB.
(2)设∠CBD=x度,∠OEB=y度,求x,y之间的数量关系.
(3)若OB=4,且OE平行△BCF的一边时,求出所有满足条件的EF的长.
(4)若OG=BG,直接写出此时sin∠OBF的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbc6acc2e933101a028091cf0b2500a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/25/1ef268bb-be9b-479e-b9db-492512b9c897.png?resizew=228)
(1)求证:△OBE
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/481b17dd4d5c68caedac72161c7777c6.png)
(2)设∠CBD=x度,∠OEB=y度,求x,y之间的数量关系.
(3)若OB=4,且OE平行△BCF的一边时,求出所有满足条件的EF的长.
(4)若OG=BG,直接写出此时sin∠OBF的值.
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名校
4 . 如图,在
中,
,以
为直径作
,交
于点D,过点D作
,垂足为点E,交
的延长线于点F.
![](https://img.xkw.com/dksih/QBM/2022/5/12/2977750638411776/2978854755213312/STEM/b1b7a947a6af42118e1275f47a00a62a.png?resizew=197)
(1)求证:
是
的切线;
(2)若
的半径为5,
,求
的长.
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2022/5/12/2977750638411776/2978854755213312/STEM/b1b7a947a6af42118e1275f47a00a62a.png?resizew=197)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c382f42af05c1741fe8a9c81129989d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
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2022-05-14更新
|
305次组卷
|
3卷引用:2021年新疆乌鲁木齐市新疆师范大学附属中学九年级第二次模拟考试数学试题
5 . 阅读理解:如图①,在锐角
中,
、
、
的对边分别是a、b、c,过点A作
于点D,则
,即
,于是
,即
,所以
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/9f3b03ef-b90b-43d6-ae19-5cd8b4c8aa08.png?resizew=345)
学以致用:(计算结果精确到0.1,
)
(1)如图②,
中,
,求
的度数和线段
的长;
(2)如图③,中国渔政204巡航船在C处测得岛屿A在北偏西
的方向上,随后船以40海里/时的速度往北偏东
的方向航行,半小时后到达B处,此时船在B处测得岛屿A在北偏西
的方向上,求此时船与岛屿A的距离
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19c00ba79042bb355f8b86b3ccf0ee55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aa591592655252976cc203a71f3805e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5022ce20f86e08987e8ee52a68588a7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/819ec21933abc80320ae0cb5d1a3592b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1501d4035822b34fcc2378f1e316f159.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/9f3b03ef-b90b-43d6-ae19-5cd8b4c8aa08.png?resizew=345)
学以致用:(计算结果精确到0.1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91d4760148fc1f8e0881c73569079e8f.png)
(1)如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf39489ac30869d6c9569c993f503f60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)如图③,中国渔政204巡航船在C处测得岛屿A在北偏西
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aee6e4e9350a2665df8597ff8045bbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/391479c151307826c9765a47a5f10503.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次
6 . 如图,在圆内接四边形ABCD中,BD=CD,DE⊥BA交BA的延长于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/16/dfa06b80-9d12-41ee-8dfa-3bf96a8a0cd7.png?resizew=174)
(1)求证:AD平分∠EAC.
(2)若AB+AC=4,cos∠ACD=
,求DE的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/16/dfa06b80-9d12-41ee-8dfa-3bf96a8a0cd7.png?resizew=174)
(1)求证:AD平分∠EAC.
(2)若AB+AC=4,cos∠ACD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7294f5ae2a24ff42e84cd9773b2a7287.png)
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7 . 已知,如图,△ABC中,∠B=30°,BC=6,AB=7,D是BC上一点,BD=4,E为BA边上一动点,以DE为边向右侧作等边三角形△DEF.
(1)当F在AB上时,BF长为_____ ;
(2)连结CF,则CF的取值范围为_____ .
(1)当F在AB上时,BF长为
(2)连结CF,则CF的取值范围为
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/8362228f-0b4c-4416-a60a-39bca882e7e3.png?resizew=200)
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2022-03-18更新
|
134次组卷
|
2卷引用:2021年浙江省嘉兴市中考数学二模试卷
8 . 定义:三角形一边上的点将该边分为两条线段,且这两条线段的积等于这个点到这边所对顶点连线的平方,则称这个点为三角形该边的“好点”.如图1,
中,点D是BC边上一点,连接AD,若
,则称点D是
中BC边上的“好点”.
![](https://img.xkw.com/dksih/QBM/2022/3/9/2932384238600192/2938878539399168/STEM/e9c49dfee37f46e981e6dcd671e5a787.png?resizew=550)
(1)如图2,点D是
中BC边上的“好点”,且
,
,
,则
;
(2)
中,
,
,
,点D是BC边上的“好点”,求线段BD的长;
(3)如图3,
是⊙O的内接三角形,点H在AB上,连接CH并延长交⊙O于点D.若点H是
中CD边上的“好点”.
①求证:
;
②若
,⊙O的半径为R,且
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58805525d602027c35573f81d3791af0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://img.xkw.com/dksih/QBM/2022/3/9/2932384238600192/2938878539399168/STEM/e9c49dfee37f46e981e6dcd671e5a787.png?resizew=550)
(1)如图2,点D是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68e744f480e11f588570c5d6738799f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c978d92edf0c4c1ef8620c17df75d35e.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ed3a08add0f389dbe3f7f74575faf45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3568f51bde4e391c8f08ff3d55989aef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b3718c142e73a15b5768a10735a388c.png)
(3)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efeccd375f7ee16b46cc1f5c22d1995f.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d4e976eb80905f467fec7e550e966c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1665c476c556bb9c2c8daf83e21deac4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8f4044a07cc709072e5d65ac69522e9.png)
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名校
解题方法
9 . 等腰△ABC中,BA=BC,过点A作AD⊥BC于点D,平面上有一点E,连接ED,EB,ED=2EB,作∠BED的角平分线交BC于点F.
![](https://img.xkw.com/dksih/QBM/2022/3/12/2934618814857216/2935951922896896/STEM/d081033901684e208d068fcfaa9b5ecf.png?resizew=419)
(1)如图1,当∠EBC=90°时,若∠BAD=45°,BE=2
,求线段DC的长;
(2)如图2,当∠EBC>90°时,过点F作FG⊥AC,分别交AC,AD于点G,H,若AD=2BF,P为EF中点,连接BP,求证:AB﹣3BP=DH;
(3)如图3,在(1)问的条件下,BE上取点O,BO
,点M,N为线段BD上的两个动点(点M在点N的左侧),连接AN,将△AND绕点D逆时针旋转得到△A′N′D,若满足A′D⊥AN于点P,连接OM,MP,当OM+MP的值最小时,直接写出△OMP的面积.
![](https://img.xkw.com/dksih/QBM/2022/3/12/2934618814857216/2935951922896896/STEM/d081033901684e208d068fcfaa9b5ecf.png?resizew=419)
(1)如图1,当∠EBC=90°时,若∠BAD=45°,BE=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(2)如图2,当∠EBC>90°时,过点F作FG⊥AC,分别交AC,AD于点G,H,若AD=2BF,P为EF中点,连接BP,求证:AB﹣3BP=DH;
(3)如图3,在(1)问的条件下,BE上取点O,BO
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/186b06e8a95341cb793d0101639319cd.png)
您最近一年使用:0次
2022-03-14更新
|
626次组卷
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3卷引用:2021年重庆市第一中学中考数学三模试题
10 . 如图,正方形ABCD的边长为1,取AB中点E,取BC中点F,连接DE、AF,DE与AF交于点O.连接OC,则OC的值为( )
![](https://img.xkw.com/dksih/QBM/2022/3/2/2927600683966464/2931267232727040/STEM/3c32d615c42948dab5260d60331005b3.png?resizew=152)
![](https://img.xkw.com/dksih/QBM/2022/3/2/2927600683966464/2931267232727040/STEM/3c32d615c42948dab5260d60331005b3.png?resizew=152)
A.![]() | B.1 | C.![]() | D.![]() |
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2022-03-07更新
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483次组卷
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7卷引用:2021年湖南省株洲市中考模拟试卷(二)数学试题
2021年湖南省株洲市中考模拟试卷(二)数学试题 2022年安徽省初中学业水平考试二模数学试题卷(三海学地教育联盟)江苏省南通市如皋初级中学2021-2022学年八年级下学期第一次月考数学试题(已下线)专题28.4 锐角三角函数(培优篇)(专项练习)-2022-2023学年九年级数学下册基础知识专项讲练(人教版)江苏省南通市如皋市江防中学2021-2022学年八年级下学期第一次月考数学试题江苏省南通市如东县部分学校2022-2023学年八年级下学期第一次月考数学试题2022年湖南省株洲市天元区中考二模数学试题