如图,在
中,点
在
边上,且
,过点
作
,过点
作
交
于点
,延长
交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/21/f09c02c5-4315-4057-bab5-8704d6309c9d.png?resizew=127)
(1)直接写出
__;
(2)若
,求证:四边形
为菱形;
(3)在(2)的条件下,若
,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae1fbb1f69f91e628aa45e6265edca4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/066cd386723885c535ea720f5817847a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85cc2d13a34d55d51145ed918dbd81db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/21/f09c02c5-4315-4057-bab5-8704d6309c9d.png?resizew=127)
(1)直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82af346039322160ddc35e4e20c087b3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8528f2e0f27a3d580119230df64d6203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d70676406f26d339465fe3473c0c05.png)
(3)在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/904a4fe5c28fd962f7b303af3acd6cab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d70676406f26d339465fe3473c0c05.png)
更新时间:2024-03-21 14:03:06
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,矩形
的对角线
交于点F,延长
到点C,使
,延长
到点D,使
,连接![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a3d7deb42af5fd1dc55025e77bf24a5.png)
是菱形;
(2)若
,求菱形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e20e9d6c7e003d1a312b722e5e7fd4c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7de2d639f3a6962a894a37b107e8d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f842145a92b63d04c0fe88001f01d31e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce05f91ce17863abc8a5a8f6002b75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a3d7deb42af5fd1dc55025e77bf24a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/598f26d4ea2c4f1b0d04877454965809.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,菱形
对角线交于点
,
,
.
是矩形;
(2)若
,
,求菱形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3275b04cb57af1d26fe2562cc4daa445.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83b5d737d39e5ea753c6c824dd964751.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5e89d43151016343d2ab6c4851565e7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75929268210da5976bc37d080da030dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348fb71fbc47fd87e9ce011652ef4186.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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解答题-作图题
|
适中
(0.65)
名校
【推荐1】如图,在
中,用直尺和圆规作图:(不写作法,保留作图痕迹)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/26/f91b6b44-4594-46c5-b88a-685021f7bfdf.png?resizew=403)
(1)如图①,若点D在边
上,求作
,使得点E、F分别在
上.
(2)如图②,若点D在边
上,求作菱形
,使得点E、F分别在
上.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/26/f91b6b44-4594-46c5-b88a-685021f7bfdf.png?resizew=403)
(1)如图①,若点D在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fa18870da9d55428648db08ac433136.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ed1fce01430ae31294c29d626626f0.png)
(2)如图②,若点D在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e08c14e87a2bcf7090eab2fea73667d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ed1fce01430ae31294c29d626626f0.png)
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解答题-作图题
|
适中
(0.65)
名校
【推荐2】已知:在
中,
.求作:菱形
.
①延长
,以点O为圆心,
长为半径作弧,与
的延长线交于点C;
②延长
,以点O为圆心,
长为半径作弧,与
的延长线交于点B;
③连接
.
所以四边形
即为所求作的菱形.
(1)使用直尺和圆规作图(保留作图痕迹);
(2)完成下面的证明.
证明:∵
,
,
∴四边形
是平行四边形.
∵
,
∴
.
∴平行四边形
是菱形.( )(填推理的依据).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/372629a8666de1e9bac3e7daadcac7b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfd4678832abebbe835f3032d11f4e49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
①延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
②延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71b63d2504bd3ecce8c10560b142356f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71b63d2504bd3ecce8c10560b142356f.png)
③连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b467455ea6b8b7f5e6dd53110bc22060.png)
所以四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(1)使用直尺和圆规作图(保留作图痕迹);
(2)完成下面的证明.
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fd64a51dc0617e5e1e5dd61f80bbe35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f531efc1514b3ce6df39054c604f9eaa.png)
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfd4678832abebbe835f3032d11f4e49.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
∴平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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解答题-问答题
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适中
(0.65)
【推荐1】如图,∠C=90°,点A、B在∠C的两边上,CA=30,CB=20,连接AB.点P从点B出发,以每秒4个单位长度的速度沿BC的方向运动,到点C停止.当点P与B、C两点不重合时,作PD⊥BC交AB于点D,作DE⊥AC于点E.F为射线CB上一点,使得∠CEF=∠ABC.设点P运动的时间为x秒.
(1)用含有x的代数式表示CE的长.
(2)求点F与点B重合时x的值.
(3)当点F在线段CB上时,设四边形DECP与四边形DEFB重叠部分图形的面积为y(平方单位).求y与x之间的函数关系式.
(1)用含有x的代数式表示CE的长.
(2)求点F与点B重合时x的值.
(3)当点F在线段CB上时,设四边形DECP与四边形DEFB重叠部分图形的面积为y(平方单位).求y与x之间的函数关系式.
![](https://img.xkw.com/dksih/QBM/2019/3/6/2154827473100800/2157711797870592/STEM/deade13ac7a14a3c83f51df975f8e4f8.png?resizew=138)
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解答题-问答题
|
适中
(0.65)
【推荐2】如图,长度为5的动线段
分别与坐标系横轴、纵轴的正半轴交于点
、点
,点
和点
关于
对称,连接
,过点
作
轴的垂线段
,交
轴于点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(1)移动点
,发现在某一时刻,
和以点
为顶点的三角形相似,求这一时刻点
的坐标;
(2)移动点
,当
时求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/354a57a4fda4f140dd869138539fa652.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(1)移动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd2981bf2261343f905ec1b5355a3c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db1e4412640778997853b5941b7880fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)移动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48c23925e29ed8363dba170007f1ee2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/2019/7/4/2239657357672448/2240398465933312/STEM/dd12f521db35425d82f54244b883e966.png?resizew=142)
您最近一年使用:0次