如图,在平面直角坐标系中,O为坐标原点,点B和点C在x轴上,点A在y轴上,
,
,且a,b满足
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/12/76eace82-ab4c-46fd-8a09-8fafd7d5998f.png?resizew=240)
(1)证明
为等边三角形;
(2)现有一动点P从点A出发,沿y轴负方向运动,速度为1个单位长度每秒,连接
,在
的下方作等边三角形
过点Q作
轴,垂足为D,设点P的运动时间为t秒,
的长度为d,求d与t之间的关系式;(用含t的式子表示d)
(3)在(2)问的条件下,已知
,当
为等腰直角三角形时,求t的值,并求出此时直线
与x轴的交点E的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63af9e953d4ec2406f40d675c237f6f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aada537209e8ab7626e42b17f68907b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cf3779ab35321c53ebf033fb0d464e4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/12/76eace82-ab4c-46fd-8a09-8fafd7d5998f.png?resizew=240)
(1)证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)现有一动点P从点A出发,沿y轴负方向运动,速度为1个单位长度每秒,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a4613db540c9cb6a9d7e963bf89c2a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac5c9bc238d2eb0e735b0477417ffec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c118858379800688c993a8b61270b356.png)
(3)在(2)问的条件下,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/484caf98eade020e30dc4f67b4ee1c8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ee780a7d0e8811fb04d955304543fce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
更新时间:2024-03-12 10:56:47
|
相似题推荐
解答题-问答题
|
较难
(0.4)
名校
【推荐1】在平面直角坐标系中,对于点
和点
,若满足:
,则称点Q为点P的理想点.例如,点
的理想点为
.
(1)点
的理想点坐标是 ;若点P的理想点为
,则点P的坐标是 ;
(2)若点
的理想点在直线
上,则a的值为 ;
(3)点P在直线
上,其横坐标为
,点Q为点P的理想点.若点Q到x轴的距离等于它到y轴的距离的2倍,求
的值;
(4)正方形
各顶点的坐标分别为
,
,
,
.点
在直线
上,点Q为点P的理想点,连结
.当线段
与正方形
的边有且只有一个公共点时,直接写出m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b21872d8f6a518e0a2993ccf7a795ed2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/defd208a1573c26c88e0ed21c5f89ade.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f1aeea19be60f00dbd0fdbb51703ff2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80991c1f0c963104740e50cfff6f29a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d5861c3ef04ab002d3b6b50cbc81eb8.png)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/135d867eac30e5a4cff409f70464a3fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b87365ea3c8ea96a4f545e6e095e70b0.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9df29c6cb461e225fad73fa17fce943b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/650353eda77d014bb42d185bd967e549.png)
(3)点P在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e6e15daf7b14dbff32c390f4984dcfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
(4)正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcbc328ed803646d8646560050ed0ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be3512fdaf9177e49972ed35fa2ca5a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/494fefc0ce257223a608f774d9fdc5f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14fb45f3b5485ae0944808625c59af96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b21872d8f6a518e0a2993ccf7a795ed2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa6342e0a5a8942cfb1cf535ceb2c50d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
【推荐2】如图1所示,已知点
,有以点P为顶点的直角的两边分别与x轴、y轴相交于点M、N.
(1)试说明
;
(2)若点M坐标为
,点N坐标为
,请直接写出m与n之间的数量关系;
(3)如图2所示,过点P作线段
,交x轴正半轴于点A,交y轴负半轴于点B,使得点P为
中点,且
,绕着顶点P旋转直角
,使得一边交x轴正半轴于点M,另一边交y轴正半轴于点N,此时,
和
是否还相等,请说明理由;
(4)在(3)条件下,请直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e1d93b5a9750ad4b33d7a6acca4b4a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/15/e1ee8a7f-ddf7-445c-b09e-d1a41a81a64d.png?resizew=288)
(1)试说明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4acd79bb9fb06f7c806eb6e17e4b613.png)
(2)若点M坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f9c0002b13f6cae093cd9dc9f19941b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5905cfcc5af4b01d63237486eb6d295.png)
(3)如图2所示,过点P作线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fca3734de79f7f50b552ef62b29dc7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45a8a837c11c07073da3ff751d70278.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
(4)在(3)条件下,请直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a069f8fed40bb44c7e7fcfe958cf5b23.png)
您最近一年使用:0次
解答题-作图题
|
较难
(0.4)
名校
【推荐1】(1)如图1,梯形ABCD中对角线交于点O,AB∥CD,请写出图中面积相等的三角形;
(2)如图2,在直角坐标系中,O是坐标原点,点A(﹣2,3),B(2,1).
①分别求三角形ACO和三角形BCO的面积及点C的坐标;
②请利用(1)的结论解决如下问题:D是边OA上一点,过点D作直线DE平分三角形ABO的面积,并交AB于点E(要有适当的作图说明).
(2)如图2,在直角坐标系中,O是坐标原点,点A(﹣2,3),B(2,1).
①分别求三角形ACO和三角形BCO的面积及点C的坐标;
②请利用(1)的结论解决如下问题:D是边OA上一点,过点D作直线DE平分三角形ABO的面积,并交AB于点E(要有适当的作图说明).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/2c6f93a9-a902-4feb-bb21-b3ea1a0e9a25.png?resizew=253)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
【推荐2】在平面直角坐标系中,点,
,
.已知抛物线
(a为常数,
),与y轴相交于点C,P为顶点.
(1)当抛物线过点A时,求该抛物线的顶点P的坐标;
(2)若点P在x轴上方,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22d456e733f197ce234be5c2412fa9c2.png)
(3)在(1)的情况下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc93e193fad261689949a52819753f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/533f1f6ead0d794bb7c70cce9173d4a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/577250c86a14c7a2990bf9852c7213d5.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐3】如图,将一矩形纸片OABC放在平面直角坐标系中,
,
,
.动点Q从点O出发以每秒1个单位长的速度沿OC向终点C运动,运动
秒时,动点P从点A出发以相同的速度沿AO向终点O运动.当其中一点到达终点时,另一点也停止运动.设点P的运动时间为t(秒).
(1)OP =____________, OQ =____________;(用含t的代数式表示)
(2)当
时,将△OPQ沿PQ翻折,点O恰好落在CB边上的点D处.
①求点D的坐标;
②如果直线y = kx + b与直线AD平行,那么当直线y = kx + b与四边形PABD有交点时,求b 的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16c37ad6746619177d02eab367759ee9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd1ed579f4bacb0668d7e5fce223d4a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e798b98bc3801f050bbeb64cfa5e6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
(1)OP =____________, OQ =____________;(用含t的代数式表示)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2a51944c720568f35d443589dfc1aa.png)
①求点D的坐标;
②如果直线y = kx + b与直线AD平行,那么当直线y = kx + b与四边形PABD有交点时,求b 的取值范围.
![](https://img.xkw.com/dksih/QBM/2018/8/19/2013608802476032/2014061887963136/STEM/4fc04a57ef804149a899e8f5b837ea8f.png?resizew=265)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐1】已知:如图,直线
与x轴相交于点A,与直线
相交于点P.动点E从原点O出发,以每秒1个单位长度的速度沿着OPA的路线向点A匀速运动(E不与点O,A重合),过点E分别作EF⊥x轴于F,EB⊥y轴于B.设运动t秒时,矩形EBOF与△OPA重叠部分面积为S.
![](https://img.xkw.com/dksih/QBM/2014/2/14/1573705288081408/1573705294299136/STEM/6556cda2e932481a9c9cd4a468d6800b.png)
(1)求点P的坐标;
(2)请判断△OPA的形状并说明理由;
(3)请探究S与t之间的函数关系式,并指出t的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f60952cf8c4a68aca8f7c3fd1558504.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27f535a50414bf2b10526d16ed8b0a88.png)
![](https://img.xkw.com/dksih/QBM/2014/2/14/1573705288081408/1573705294299136/STEM/6556cda2e932481a9c9cd4a468d6800b.png)
(1)求点P的坐标;
(2)请判断△OPA的形状并说明理由;
(3)请探究S与t之间的函数关系式,并指出t的取值范围.
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】定义:有个内角为
,且对角线相等的四边形称为准矩形.
![](https://img.xkw.com/dksih/QBM/2019/11/13/2333096158208000/2333940091822080/STEM/77f7bb20-d3f7-49f1-b6a7-f6ebbe2f6fcc.png)
(1)如图1,准矩形ABCD中.
,若
,
,则
_____;
(2)如图2,直角坐标系中,
,
,若整点P使得四边形AOBP是准矩形,则点P的坐标是______;(整点指横坐标、纵坐标都为整数的点)
(3)已知,准矩形ABCD中,
,
,
,当
为等腰三角形时,请求出这个准矩形的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://img.xkw.com/dksih/QBM/2019/11/13/2333096158208000/2333940091822080/STEM/77f7bb20-d3f7-49f1-b6a7-f6ebbe2f6fcc.png)
(1)如图1,准矩形ABCD中.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c978d92edf0c4c1ef8620c17df75d35e.png)
(2)如图2,直角坐标系中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f94c4f6b762fddb0e313050ef6932eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54fe2c124d5bbbbe666ee145cd454b6b.png)
(3)已知,准矩形ABCD中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐1】已知正方形
和等腰
,
,
,连接
.
![](https://img.xkw.com/dksih/QBM/2021/7/1/2754872177491968/2819130003881984/STEM/8cb85b86-5402-4b77-b1d6-c7ccfc216b92.png)
(1)如图1,点
在
边上,若
,
,求
的长;
(2)如图2,点
在
边上,点
为
的中点,求证:
;
(3)如图3,点
在边
上,点
为
的中点,若
,
,则
的长为_____.(直接写出结果).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffff36e4dc6bcfea7dd5960d69082e6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a33f381b03270154695d6b5421b1e739.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c0d6068866683547b733dbe005031a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/2021/7/1/2754872177491968/2819130003881984/STEM/8cb85b86-5402-4b77-b1d6-c7ccfc216b92.png)
(1)如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeedb5f361a1baff6338436fff6c471d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
(2)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/110d486dd63ab065d499310fd55de9d4.png)
(3)如图3,点
![](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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7cbfaec1d9dcaaf159b060163436113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0761165f1176f3a5fe4f7b052832316d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】综合与实践
问题情境:
在“综合与实践”课上,老师提出如下问题:将正方形
与正方形
按图1所示的方式摆放,其中
,试求
的长.
数学思考:
(1)请你解答老师提出的问题.
深入探究:
(2)老师将图1中的正方形
绕点
逆时针方向旋转,并让同学们提出新的问题.
①“善思小组”提出问题:如图2,当点
落在边
上时,连接
、
,延长
与
交于点
,求
的长.请你解答此问题.
②“智慧小组”提出问题:如图3,连接
、
,线段
与
交于点
,当点
在直线
左侧时,连接
,若存在实数
满足等式
,求出
的值.请你思考此问题,直接写出结果.
问题情境:
在“综合与实践”课上,老师提出如下问题:将正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70ff9a4f0f16c4bce711d5d4e6c5d086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/1/965aa79c-cc9d-427f-81b3-3bcab091aadc.png?resizew=462)
数学思考:
(1)请你解答老师提出的问题.
深入探究:
(2)老师将图1中的正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
①“善思小组”提出问题:如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
②“智慧小组”提出问题:如图3,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/698a6c69ff0837bd3dddadffed6d7a37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次