如图,在
中,
,
,点
在
上,点
在
上,连接
,点
,
分别是
和
的中点,连接
,
,且
,连接
,
.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/309ab4e3887f4ffe6bada4406f7a3d57.png)
(2)若
,则用含
的式子表示线段
的长;
(3)在(2)问的条件下,当
时,求线段
长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4300aefd67369742e2b1ddcdc02dd495.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5ebb1a87e08aed3521817cf5ffd1196.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db7ea03277f8408fabe5b327cc34838f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d87448e09eaa816e50ae92d111d5ded6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e7a67b2c9427e9243f08e1bf6697cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a679040c4d556723e482bacbab41356d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/309ab4e3887f4ffe6bada4406f7a3d57.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2c6d947deb267f245bf29beca83bba6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
(3)在(2)问的条件下,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca208a68dd37e00903085736eafdedb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
更新时间:2024-04-13 14:35:47
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】已知:如图,等边
中,
,
分别在
,
边上运动,且始终保持
,点
、
始终不与等边
的顶点重合,连接
、
,
,
交于点
.
(1)试说明
≌
;
(2)直接写出运动过程中,
、
、
三条线段长度之间的等量关系;
(3)运动过程中,
的度数是否会改变?如果改变,请说明理由;如果不变,求出
的度数,再说明理由.
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421291381be28da4bd16560fd383b4a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/10/5f980277-84cb-46f2-bcb8-19e8b6da85f7.jpg?resizew=123)
(1)试说明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2657e02314469ad2b13d31dce41b4343.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f517953a21c2a45fd8465072c44bfc.png)
(2)直接写出运动过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(3)运动过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95ee1c8b8f17e6adfe29201544ee304c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95ee1c8b8f17e6adfe29201544ee304c.png)
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【推荐2】如图所示,在
ABC中,点D在AC上,连接BD,且∠ABC=∠C=∠1,∠A=∠3,求∠A的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/17/fb7adb4a-53ca-48f4-bbc4-e80517f49ea1.png?resizew=172)
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【推荐1】学完“轴对称”这一章后,老师布置了一道思考题:如图所示,点M,N分别在等边△ABC的BC、CA边上,且BM=CN,AM,BN交于点Q,求证:∠BQM=60°.
![](https://img.xkw.com/dksih/QBM/2014/12/11/1573766512812032/1573766518857728/STEM/927ab9d8353347aa9f6d76cf1dfba718.png?resizew=144)
(1)请你完成这道思考题:
(2)做完(1)后,同学们在老师的启发下进行了反思,提出许多问题,如:
①若将题中“BM=CN”与“∠BQM=60°”的位置交换,得到的是否仍是真命题?
②若将题中的点M,N分别移动到BC,CA的延长线上,是否仍能得到∠BQM=60
?
③若将题中的条件“点M,N分别在正三角形ABC的BC、CA边上”改为“点M,N分别在正方形ABCD的BC,CD边上”,是否仍能得到∠BQM=60°?
请你作出判断,在下列横线上填写“是”或“否”:
①________;②_______;③________.并对②,③的判断,选择一个画出图形,并给出证明.
![](https://img.xkw.com/dksih/QBM/2014/12/11/1573766512812032/1573766518857728/STEM/927ab9d8353347aa9f6d76cf1dfba718.png?resizew=144)
(1)请你完成这道思考题:
(2)做完(1)后,同学们在老师的启发下进行了反思,提出许多问题,如:
①若将题中“BM=CN”与“∠BQM=60°”的位置交换,得到的是否仍是真命题?
②若将题中的点M,N分别移动到BC,CA的延长线上,是否仍能得到∠BQM=60
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/596f15387e7223cc2086c0574cda4837.png)
③若将题中的条件“点M,N分别在正三角形ABC的BC、CA边上”改为“点M,N分别在正方形ABCD的BC,CD边上”,是否仍能得到∠BQM=60°?
请你作出判断,在下列横线上填写“是”或“否”:
①________;②_______;③________.并对②,③的判断,选择一个画出图形,并给出证明.
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【推荐2】如图,在△ABC中,∠C=90°,AD平分∠CAB,交CB于点D,过点D作DE⊥AB于点E.
(1)求证:△ACD≌△AED;
(2)若E为AB中点,求∠B的度数.
(1)求证:△ACD≌△AED;
(2)若E为AB中点,求∠B的度数.
![](https://img.xkw.com/dksih/QBM/2018/12/19/2100224955678720/2101388410494976/STEM/531e979354b64842a280411586e55eb3.png?resizew=216)
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【推荐1】如图,在
中,
,点D为
边的中点.动点P从点B出发,以每秒2个单位长度的速度沿边
向终点C运动,同时动点Q从点A出发,以每秒
个单位长度的速度沿边
向终点B运动,当点P与点D、C不重合时,以
为邻边作
,设点P的运动时间为t秒
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/c8bee5eb-c3fa-4cc6-ac00-7ef4ecfeb38b.png?resizew=202)
(1)用含t的代数式表示线段
的长;
(2)当线段
被边
平分时,求t的值;
(3)设
的面积为S,求S与t之间的函数关系式,并求出
时t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e01cb9f0920936f8ac8a95a56f4ceeeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/670638c5ec665de31e16668557873bc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d544c6eb82af1e6d94c358ec90dc27c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07eabb3ff92cc5e071c48df759e64ab8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/c8bee5eb-c3fa-4cc6-ac00-7ef4ecfeb38b.png?resizew=202)
(1)用含t的代数式表示线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
(2)当线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf3d566704b44ea4ef1f99c37bd46902.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d544c6eb82af1e6d94c358ec90dc27c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78ee88e5c5542a9ca51883e7d6a624dd.png)
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【推荐2】如图,
是等边三角形,
,P是
边上一动点,由A向C运动(与A、C不重合),Q是
延长线上一动点,与点P同时以相同的速度由B向
延长线方向运动(Q不与B重合),过Р作
于E,连接
交
于D.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/5/b829e62a-30a4-4b36-8c8a-23abb79ad6e0.png?resizew=279)
(1)证明:在运动过程中,点D是线段
的中点;
(2)当
时,求
的长;
(3)在运动过程中线段
的长是否发生变化?如果不变,求出线段
的长;如果变化请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b939af5ba06e279cce39396aaf0fae06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04fb30a9d07e410ac92c34b8ad0133db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/5/b829e62a-30a4-4b36-8c8a-23abb79ad6e0.png?resizew=279)
(1)证明:在运动过程中,点D是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4150135ffdaa881d3cbd1556c2e2c192.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
(3)在运动过程中线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
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【推荐1】如图,点A反比例函数
的图象上,点C在x轴上,
轴,垂足为B,
,
,
,
交反比例函数的图象于点D.
(2)求点D的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c9940526785ca763da2dfa35e77c934.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24624dffd30b66a5e4de57362b32b2a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63447ea996b9036a7a7ae726cc382cdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4fc2d383876afe5be1103352571805b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b27e47690ed332c573186992b6d25654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
(2)求点D的坐标.
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【推荐2】如图,矩形ABCD中,
,
,
的平分线交边AD与点E,交CD延长线于点F.点P从点B出发以
的速度沿射线BE方向运动.过点P作
于Q,点N在BP延长线上,且
.以PQ、PN为邻边作平行四边形PQMN,当点N与点F重合时,点P停止运动.设点P的运动时间为t(s),平行四边形PQMN与矩形ABCD重合部分的面积为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/31/4fadfce3-e860-4103-9b8f-787007b44f86.png?resizew=175)
(1)直接写出线段AE的长;
(2)当点N与点F重合时,求t的值;
(3)求S关于t的函数解析式,并直接写出自变量t的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df3b2901ad26337818f75e81448ebb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9d291cfc6c4677d20f8674c57322b46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3caca1606e2c20d8b3c7aae9d132012.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/902f24325565a9dd95128a633a240da2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48621b0abb72f3072607b39ed8c19625.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cab9091bc1886a3fd3d17160b2d41ded.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/31/4fadfce3-e860-4103-9b8f-787007b44f86.png?resizew=175)
(1)直接写出线段AE的长;
(2)当点N与点F重合时,求t的值;
(3)求S关于t的函数解析式,并直接写出自变量t的取值范围.
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