四边形
中,
平分线段
交
于O,
是矩形;
(2)若
于E,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acb823fc1435381c46583af166753421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/137243e5d675b5c6462cf3ad21e2255d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c51c25b65a37b676ae3c3b71c29f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d49b8e1c5e8ecfcedbfaa286387df17b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
更新时间:2023-10-03 11:42:16
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,BD是△ABC的角平分线,DE⊥AB,
,垂足分别为E、F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/18/f04d997c-e4b2-4056-bf95-8edc53559ce5.png?resizew=135)
(1)试说明:BE=BF;
(2)若△ABC的面积为75,AB=15,DE=6,则BC等于多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d276d0010fd458383ea3dd61415e1aa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/18/f04d997c-e4b2-4056-bf95-8edc53559ce5.png?resizew=135)
(1)试说明:BE=BF;
(2)若△ABC的面积为75,AB=15,DE=6,则BC等于多少?
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】在
中,D是BC的中点,E,F,分别在AB,AC上. 且DE⊥DF,连EF.
(1)如图1,AB=AC,∠BAC=90°,求证:∠DEF=45°;
(2)如图2,求证:BE + CF>EF .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)如图1,AB=AC,∠BAC=90°,求证:∠DEF=45°;
(2)如图2,求证:BE + CF>EF .
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/3/8f774b36-c87c-4166-b69c-2fd07105c07c.png?resizew=259)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/3/29246120-4daf-41ce-a5c0-44dc2414cbab.png?resizew=247)
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解答题-问答题
|
适中
(0.65)
【推荐1】如图,点C在⊙O上,联结CO并延长交弦AB于点D,
,联结AC、OB,若CD=40,AC=20
.
(1)求弦AB的长;
(2)求sin∠ABO的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2076ab9281325aedd252b9b5e70037b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
(1)求弦AB的长;
(2)求sin∠ABO的值.
![](https://img.xkw.com/dksih/QBM/2018/4/26/1932330972979200/1933102359371776/STEM/d132ee288c794058baf160d9a9361be3.png?resizew=128)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐2】如图,在
中,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/f8236b25-deed-40b0-8ca8-105627255349.png?resizew=174)
(1)填空:
________;
(2)用直尺和圆规作
的垂直平分线
,
分别交
,
于点
,
;(尺规作图,保留作图痕迹);
(3)在(2)的条件下,连接
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4494a85de0be0b97a69348115aef8513.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/f8236b25-deed-40b0-8ca8-105627255349.png?resizew=174)
(1)填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
(2)用直尺和圆规作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(3)在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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解答题-问答题
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适中
(0.65)
【推荐1】如图,将
绕点A旋转得到
.
,当点
落在边
上,延长
与
交于点E.如果点E为边
的中点,求
的值;
(2)如图2,
,当点
落在边
上,且
与边
相交于点E时,如果点E、
分别为边
、
的中点,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5428a5fb6f4b14e5d6d382fcb5067449.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d42170c7d4249f6b390823606c18c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d42170c7d4249f6b390823606c18c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2465ee1fec12351943f15055dfd6ec73.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/def38f975e46bc0f372ca7ebccf6e91d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e737bc35da650eda3825d29799b5f86f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2465ee1fec12351943f15055dfd6ec73.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】用10米的铝合金制成如图窗框矩形
,其中点
分别在边
上,点
分别在
上,且
,
.记窗框矩形
的面积为s平方米,边长
为x米.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/1994312e-edf0-4b69-a646-a260d65e6f18.png?resizew=143)
(1)用含x的代数表达式表示出线段
的长为 ;
(2)求s关于x的表达式及自变量x的取值范围;
(3)求s的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ce9b6bb1f3e46026af863b2b269ecf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdcf86f7cf381c563ad80af86feeed83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edaef6b3225f9921d4318f065e4e3195.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a1a9e8acb9e2dffeaf5ee062d0fa9c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee73452ee4d5437f1399f1235b95e55f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91ec2c4b75b65482da0775ff2c4fe4d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/1994312e-edf0-4b69-a646-a260d65e6f18.png?resizew=143)
(1)用含x的代数表达式表示出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(2)求s关于x的表达式及自变量x的取值范围;
(3)求s的最大值.
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解答题-问答题
|
适中
(0.65)
【推荐1】如图,在平面直角坐标系中,一次函数
图象与坐标轴分别交于点
,
.
(1)
点的坐标为 ,
点的坐标为 ;
(2)若
为直线
在第一象限上一点,连接
,
.
①当
时,
是以
为底的等腰直角三角形,求点
的坐标;
②当
时,是否仍然存在
是以
为底的等腰直角三角形的情况?如果存在,求此时点
的坐标;如果不存在,说明理由;
③当
是以
为底的等腰三角形,且为锐角三角形时,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4de869ae6b6dc5b79fcae3de540b30bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c240561788bc63f41a6703219fb66d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48c09615735d331befd07664aa47cb8a.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0477c1369ae4ee4b852922e55725f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66a5b7813e902306477f91f9f4084cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0086b054ef120408acac806a1b1318.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4201d3bead2e48cc80052b1418f23db9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060e7930731eddbcfac592b808e9b698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4201d3bead2e48cc80052b1418f23db9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4201d3bead2e48cc80052b1418f23db9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://img.xkw.com/dksih/QBM/2021/2/4/2650944427155456/2662993881587712/STEM/9d330f57-fce0-47d4-a184-20d44d3ab803.png?resizew=318)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图1,点P在正方形
的对角线
上,正方形
的边长是a,
的两条直角边
,
分别交边
,
于点M,N.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/23/d4c11462-731d-4efc-b6fc-ee66324d4a38.png?resizew=481)
(1)操作发现:如图2,固定点P,使
绕点P旋转.
①当
,
时,四边形
的边
长是________;
②当
,
(n是正实数)时,四边形
的面积是________.
(2)猜想论证:如图3,将四边形
的形状改变为矩形,
,
,点P在矩形
的对角线
上,
的两条直角边
,
分别交边
,
于点M、N,固定点P,使
绕点P旋转,则
________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f434faeaeb46fac932506b706f90ffa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a3137705cb4170baafa66ff46eefb7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ca1d09859dfab140e55e3cc3e7d67d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cdd9f345915ae742ed3dcd3f9678264.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/23/d4c11462-731d-4efc-b6fc-ee66324d4a38.png?resizew=481)
(1)操作发现:如图2,固定点P,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91b51d3992644d37dc71c9b5a97d515c.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31a470095e295c734a2f368cc6baf1b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f08022afdd71b41a2e339a18dfddab4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7c12e7d93fbe0427bdbcf19a776008f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3d9792485ccd1ba479ceba6397c15ff.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31a470095e295c734a2f368cc6baf1b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14cf88e41dab34fe5e1f0b8c36c75600.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7c12e7d93fbe0427bdbcf19a776008f.png)
(2)猜想论证:如图3,将四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d42e97eee705d164e6ac6de9ecd6d1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c52b857c7ca55dfa6da108df1d3cee2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f434faeaeb46fac932506b706f90ffa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a3137705cb4170baafa66ff46eefb7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ca1d09859dfab140e55e3cc3e7d67d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cdd9f345915ae742ed3dcd3f9678264.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91b51d3992644d37dc71c9b5a97d515c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd9079f7df4bd028da12892d5269d900.png)
您最近一年使用:0次