已知:如图①,直线MN⊥直线PQ,垂足为O,点A在射线OP上,点B在射线OQ上(A、B不与O点重合),点C在射线ON上且OC=2,过点C作直线l//PQ,点D在点C的左边且CD=3.
(1)直接写出△BCD的面积.
(2)如图②,若AC⊥BC,作∠CBA的平分线交OC于E,交AC于F,求证:∠CEF=∠CFE.
(3)如图③,若∠ADC=∠DAC,点B在射线OQ上运动,∠ACB的平分线交DA的延长线于点H,在点B运动过程中
的值是否变化?若不变,求出其值;若变化,求出变化范围.
(1)直接写出△BCD的面积.
(2)如图②,若AC⊥BC,作∠CBA的平分线交OC于E,交AC于F,求证:∠CEF=∠CFE.
(3)如图③,若∠ADC=∠DAC,点B在射线OQ上运动,∠ACB的平分线交DA的延长线于点H,在点B运动过程中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53d8ed4083d6eb92f3d015f961078606.png)
![](https://img.xkw.com/dksih/QBM/2021/6/10/2740023676977152/2740142735065088/STEM/2982cf98-ef52-44a4-990e-e91d1af7ca1d.png)
17-18七年级下·江苏无锡·期中 查看更多[6]
更新时间:2021-06-10 19:37:34
|
相似题推荐
解答题-作图题
|
较难
(0.4)
名校
【推荐1】已知:如图1,
,点
,
分别为
,
上一点.
![](https://img.xkw.com/dksih/QBM/2021/1/14/2635949243228160/2637181945225216/STEM/e8f2738e7dd94095aae9318f7d5ea654.png?resizew=309)
(1)在
,
之间有一点
(点
不在线段
上),连接
,
,探究
,
,
之间有怎样的数量关系,请补全图形,并在图形下面写出相应的数量关系,选其中一个进行证明.
(2)如图2,在
,
之两点
,
,连接
,
,
,请选择一个图形写出
,
,
,
存在的数量关系(不需证明).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2021/1/14/2635949243228160/2637181945225216/STEM/e8f2738e7dd94095aae9318f7d5ea654.png?resizew=309)
(1)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3b59874dae8b394a4e434aa3875708a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b89403a4db68423b83136d2cbff6225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2c131411dcc3e47749dced15869ee5c.png)
(2)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360496a4f5cc8a5faca5e089ae4f9531.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3b59874dae8b394a4e434aa3875708a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4067b50a6aa2a6462f1d9df4b093f66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9886ccd7c5c410280a2c4470344ccefc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/068dcad9c70dc4d2fe2ad12b37e48556.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】如图,点A的坐标为
,点B在y轴上,将△OAB沿x轴负方向平移,平移后的图形为△DEC,且点C的坐标为
,且a,b满足
.
(2)在四边形ABCD中,点P从点B出发,沿“
”移动.若点P的速度为每秒1个单位长度,运动时间为t秒,回答下列问题:
①当
______时,点P的横坐标与纵坐标互为相反数;
②当
时,设
,
,
,请问x,y,z之间的数量关系能否确定?若能,请用含x,y的式子表示z,若不能,请说明理由;
③当点P运动到什么位置时,直线OP将四边形ABCD的面积分成2:5两部分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cf75310b48015af5b03e8b4ea7a16ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bb9056a484e06d3cd225c7293033d1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c602848e6f8e9ac6b66620203e92a7c.png)
(2)在四边形ABCD中,点P从点B出发,沿“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31a1b3f3604070f5d44ef3d2bf75e6c3.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2fa276c1b5ac04a1c06f82e091b1bd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d2d92d4dc14bac13af8618318a4fa5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b102597d403eb57c20ff2731002ae074.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f167af261d4a0df7953cd4c848bd90fd.png)
③当点P运动到什么位置时,直线OP将四边形ABCD的面积分成2:5两部分.
您最近一年使用:0次
解答题-作图题
|
较难
(0.4)
名校
【推荐3】热爱数学的小厦同学在平面直角坐标系中选取了直线l上的两点
和
,然后如图11所示摆放一个直尺,使直尺边缘恰好经过这两个点,他惊奇地发现直线l上的任意一点沿直线l移动时,其坐标变化是有规律的.
(1)【描述规律】我们发现:①将点A沿此直线移动到点B时,横坐标增加了4个单位长度,纵坐标增加了______个单位长度;将点B沿此直线移动到点
时,横坐标增加了2个单位长度,其纵坐标增加了______个单位长度;
②现将直线l上任意一点
沿直线l平移至点Q,若点Q的横坐标为
,则点Q的纵坐标为______(用含n、t的式子表示);
(2)【应用规律】如图11,继续在直尺边缘放置一个三角形纸板
,点
,点
,将三角形纸板
紧靠直尺边缘向上推动至
的位置,其中点A的对应点是点
,点D的对应点是点
,点C的对应点是点G,求点G的坐标;(可直接使用(1)中的规律)
(3)在(2)的条件下,如图所示,点
在x轴上,其中
.点K在直线
上,
,在
内部有一点N,使
,
.若四边形
为凸四边形,则请在图12中画出示意图,并求
与
的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a525534689bd2701205d4ab17574c39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29610a3415c1e795d35979a5a9ff69f3.png)
(1)【描述规律】我们发现:①将点A沿此直线移动到点B时,横坐标增加了4个单位长度,纵坐标增加了______个单位长度;将点B沿此直线移动到点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3654254401fc902c3cb4912969f21f88.png)
②现将直线l上任意一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82aaa597a5aa6176863eda3fdf83e181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037d2f966d0dca395a1dbd8e843faa17.png)
(2)【应用规律】如图11,继续在直尺边缘放置一个三角形纸板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d78fc7fcb2762de28dcef8aa3aa0e49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47d5915a23f507a55e7fad0c58749f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f40087e7e9f60a9ba13002a6fcf7f48e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d78fc7fcb2762de28dcef8aa3aa0e49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e5e61804ce550636a0354e0a78a22d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e58eb892e183b024c876c47dfed3c136.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f36e51ed5ec24941cb42107e1c2b62a.png)
(3)在(2)的条件下,如图所示,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532fad8c295fde2f0d6e34f1a9a85b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76113ac98ae6de8fe08e79b03c76bde9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a679040c4d556723e482bacbab41356d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a5b1ed9e12477584f700c0484bbb574.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ab599f38a3f125baabbf5612028ee52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/614c579b014783c2aab50af7c1abf49d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74534311a29325161195be2371efc5cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f365c0e366ad5c3b51f77c3a565116ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e0b5f86184740950747e26eefdf1e8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9dcdaa10d8eaff46f5a36b3290be39a.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐1】[发现]如图∠ACB=∠ADB=90°,那么点D在经过A,B,C三点的圆上(如图①)
![](https://img.xkw.com/dksih/QBM/2017/3/7/1638674158026752/1646427263049728/STEM/400a3e9d12fd455cb2dbaebcce5bb6b3.png?resizew=569)
[思考]如图②,如果∠ACB=∠ADB=a(a≠90°)(点C,D在AB的同侧),那么点D还在经过A, B,C三点的圆上吗?
我们知道,如果点D不在经过A,B,C三点的圆上,那么点D要么在圆O外,要么在圆O内,以下该同学的想法说明了点D不在圆O外.
请结合图④证明点D也不在⊙O内.
![](https://img.xkw.com/dksih/QBM/2017/3/7/1638674158026752/1646427263049728/STEM/759148d79b7b4e39a5ee634b504c94d3.png?resizew=297)
[结论]综上可得结论:如图②,如果∠ACB=∠ADB=a(点C,D在AB的同侧),那么点D在经过A,B,C三点的圆上,即:点A、B、C、D四点共圆.
[应用]利用上述结论解决问题:
如图⑤,已知△ABC中,∠C=90°,将△ACB绕点A顺时针旋转一个角度得△ADE,连接BE CD,延长CD交BE于点F,
(1)求证:点B、C、A、F四点共圆;
(2)求证:BF=EF.
![](https://img.xkw.com/dksih/QBM/2017/3/7/1638674158026752/1646427263049728/STEM/b29e28f203894b7cad045b177ca22ff1.png?resizew=229)
图⑤
![](https://img.xkw.com/dksih/QBM/2017/3/7/1638674158026752/1646427263049728/STEM/400a3e9d12fd455cb2dbaebcce5bb6b3.png?resizew=569)
[思考]如图②,如果∠ACB=∠ADB=a(a≠90°)(点C,D在AB的同侧),那么点D还在经过A, B,C三点的圆上吗?
我们知道,如果点D不在经过A,B,C三点的圆上,那么点D要么在圆O外,要么在圆O内,以下该同学的想法说明了点D不在圆O外.
请结合图④证明点D也不在⊙O内.
![](https://img.xkw.com/dksih/QBM/2017/3/7/1638674158026752/1646427263049728/STEM/759148d79b7b4e39a5ee634b504c94d3.png?resizew=297)
[结论]综上可得结论:如图②,如果∠ACB=∠ADB=a(点C,D在AB的同侧),那么点D在经过A,B,C三点的圆上,即:点A、B、C、D四点共圆.
[应用]利用上述结论解决问题:
如图⑤,已知△ABC中,∠C=90°,将△ACB绕点A顺时针旋转一个角度得△ADE,连接BE CD,延长CD交BE于点F,
(1)求证:点B、C、A、F四点共圆;
(2)求证:BF=EF.
![](https://img.xkw.com/dksih/QBM/2017/3/7/1638674158026752/1646427263049728/STEM/b29e28f203894b7cad045b177ca22ff1.png?resizew=229)
图⑤
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】如图,已知:AB
CD,E为平面内一动点,连接AE、CE.
(1)如图1,若∠A=120°,∠C=150°,则∠E= °;
(2)如图2,∠EAB的角平分线与∠ECD的角平分线相交于点F.求证:∠AEC+2∠AFC=360°;
(3)如图3,在(2)的条件下,作AH
CE,连接AC,AC恰好平分∠EAH,过点E作PQ⊥DC,交DC延长线于点Q,交HA延长线于点P,若∠APQ:∠ECF=5:7,求∠CAG的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
(1)如图1,若∠A=120°,∠C=150°,则∠E= °;
(2)如图2,∠EAB的角平分线与∠ECD的角平分线相交于点F.求证:∠AEC+2∠AFC=360°;
(3)如图3,在(2)的条件下,作AH
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/9/c4dd8931-16c3-497e-9a80-b21c061965b5.png?resizew=508)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐3】问题:若
,点A在直线
上,点B在直线
上,点E为
,
之间一点,探
,
与
之间的关系.
![](https://img.xkw.com/dksih/QBM/2022/4/25/2965614219264000/3061818833199104/STEM/650b0103a7fd4719b6e2a60887553f07.png?resizew=550)
![](https://img.xkw.com/dksih/QBM/2022/4/25/2965614219264000/3061818833199104/STEM/4f8b76c2b5bb4b908ff187148175e8c0.png?resizew=544)
![](https://img.xkw.com/dksih/QBM/2022/4/25/2965614219264000/3061818833199104/STEM/28727483d5e447b597508abe6da86944.png?resizew=233)
(1)如图1,延长
与
交于点F(方法一);如图2,过点E作
(方法二),发现:
.请选择一种方法说明.
(2)小明同学进行了更进一步的思考:直线
,点A、C在直线a上,点B、D在直线b上,直线
,
分别平分
,
,且交于点E.
①如图3,若
,则
_____________.
②如图4,若
,则
_________.(用含x的代数式表示)
(3)如备用图,射线
与射线
相交于点O,点A、C在射线
上,
,点B、D在射线
上,其中A、B是定点,C、D是动点,且点D在点B右侧,直线
,
分别平分
,
且交于点E.若
,
,直接写出
的度数.(用含m,n的代数式表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3ea79769668d56ebea11c30db055be8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a55a1a244f81097e05e715b69580faa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e37b078d02601f76f0f8320b410809f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12977b2ed4ed1a0f425dbf1beb9dc03c.png)
![](https://img.xkw.com/dksih/QBM/2022/4/25/2965614219264000/3061818833199104/STEM/650b0103a7fd4719b6e2a60887553f07.png?resizew=550)
![](https://img.xkw.com/dksih/QBM/2022/4/25/2965614219264000/3061818833199104/STEM/4f8b76c2b5bb4b908ff187148175e8c0.png?resizew=544)
![](https://img.xkw.com/dksih/QBM/2022/4/25/2965614219264000/3061818833199104/STEM/28727483d5e447b597508abe6da86944.png?resizew=233)
(1)如图1,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e44169ca257d7e7eed3954f45a1efced.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b6d15c66142c9f538fcce8a61007d3e.png)
(2)小明同学进行了更进一步的思考:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bc8444d63d1ca92651c62fe9b220859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/246a86f34603eaf2e6a948681b831b0d.png)
①如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5dc89dd41a2c2618579a51e6018f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74385b93d0303dc37d564958c6e5c41e.png)
②如图4,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0127d97726c88377b7ce095c805b29c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74385b93d0303dc37d564958c6e5c41e.png)
(3)如备用图,射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0009063fe00277645aff1be6e32471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79cc6c50133cf92b3e30c429f63d00d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0009063fe00277645aff1be6e32471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/246a86f34603eaf2e6a948681b831b0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/101040eda20818a3436655f692ccefa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d55df893b9428c7f969850184b52fbf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/936f5f26aac7197d42a41081fb1fda0e.png)
您最近一年使用:0次