如图,半圆O的半径为2,弦AB的长度为2
,点C是劣弧
上的一个动点,点D是弦AC的中点,点E是弦BC的中点,连接DE、OD、OE.
![](https://img.xkw.com/dksih/QBM/2022/6/11/2998880263053312/2999947387101184/STEM/29f6ebae22f045fbb5929a00592b250b.png?resizew=191)
(1)求∠ABO的度数;
(2)当点C沿着劣弧
从点A开始,顺时针运动到点B时,求△CDE的外心P所经过的路径的长度;
(3)分别记△ODE,△CDE的面积为S1,S2,当S12﹣S22=
时,求AC2的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://img.xkw.com/dksih/QBM/2022/6/11/2998880263053312/2999947387101184/STEM/29f6ebae22f045fbb5929a00592b250b.png?resizew=191)
(1)求∠ABO的度数;
(2)当点C沿着劣弧
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
(3)分别记△ODE,△CDE的面积为S1,S2,当S12﹣S22=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4700efcb84c4027ce7a50af0d5212fc.png)
更新时间:2022-06-12 21:11:29
|
相似题推荐
解答题-问答题
|
困难
(0.15)
【推荐1】问题提出
(1)如图①,已知直线
,点A,B在直线a上,点C,D在直线b上,则
_______
(填“>”“<”或“=”);
问题探究
(2)如图②,⊙O的直径为20,点A,B,C都在⊙O上,
,求
面积的最大值;
问题解决
(3)如图③,在
中,
,
,
,根据设计要求,点D为
内部一点,且
,过点C作
交BD于点E,连接AE,CD,试求满足设计要求的四边形ADCE的最大面积.
![](https://img.xkw.com/dksih/QBM/2021/4/9/2695858656460800/2698037042110464/STEM/e2844aec-20cd-4795-a4a6-934725c2d07c.png)
(1)如图①,已知直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72fbc714c63815dad9a27418f6492f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c141b06b158e0cdef08fcda3ea44a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b04d3d8f7186477d8bb752a7ac56b1a.png)
问题探究
(2)如图②,⊙O的直径为20,点A,B,C都在⊙O上,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
问题解决
(3)如图③,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4630b9ca3d20635161fa8fbf812b9128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ebb33adb2310a6e03918761e68204a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a690535ef8766d108cce93b9e8544311.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef2d41a810bb2c2b61be30c16b257aad.png)
![](https://img.xkw.com/dksih/QBM/2021/4/9/2695858656460800/2698037042110464/STEM/e2844aec-20cd-4795-a4a6-934725c2d07c.png)
您最近一年使用:0次
【推荐2】如图,在矩形
中,
,
,点P在边
上(点P与端点B、C不重合),以P为圆心,
为半径作圆,圆P与射线
的另一个交点为点E,直线
与射线
交于点G.点M为线段
的中点,联结
.设
.
![](https://img.xkw.com/dksih/QBM/2021/4/22/2705000462835712/2705919457722368/STEM/8e464138-c2d3-4099-b7d5-ae2ef0b778c0.png)
(1)求y关于x的函数解析式,并写出该函数的定义域;
(2)联结
,当
时,求x的值;
(3)如果射线
与圆P的另一个公共点为点F,当
为直角三角形时,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.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/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33aa4f383b231934e0399d3fb6f8648d.png)
![](https://img.xkw.com/dksih/QBM/2021/4/22/2705000462835712/2705919457722368/STEM/8e464138-c2d3-4099-b7d5-ae2ef0b778c0.png)
(1)求y关于x的函数解析式,并写出该函数的定义域;
(2)联结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03cbeb861911d2421ab714d08aa0f062.png)
(3)如果射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/568173802070b53ead410b8c5cef8ba3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/568173802070b53ead410b8c5cef8ba3.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
解题方法
【推荐1】已知,在半圆
中,直径
,点
,
在半圆
上运动,(点
,
可以与
,
两点重合),弦
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/20/10e66936-96f8-4416-a052-b4224813f2d2.png?resizew=468)
(1)如图1,当
时,直接写出图中标注顶点的所有全等三角形;
(2)如图2,若
时,求图中阴影部分(弦AD、直径AB、弧BD围成的(图形)的面积;
(3)如图3,取CD的中点
,点
从点
开始运动到点
与点
重合时结束,在整个运动过程中:
①点M到AB的距离的最小值是______;
②直接写出点M的运动路径长______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/55c24a968c73e960698a572ab01e3698.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/20/10e66936-96f8-4416-a052-b4224813f2d2.png?resizew=468)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59f7abf31402fcfd6f86fb434adc37d1.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56e08c088f4281baf6c431ca4ee1fa0a.png)
(3)如图3,取CD的中点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
①点M到AB的距离的最小值是______;
②直接写出点M的运动路径长______.
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
解题方法
【推荐2】如图,将正方形
的边
绕点
逆时针旋转至
,旋转角为
,连接
,
,
的角平分线交
于点
,连
.
![](https://img.xkw.com/dksih/QBM/2021/5/22/2726278172868608/2729203321397248/STEM/a7b626a8-ac5c-400e-80da-64109e57c05c.png)
(1)如图1,
,直接写出
的大小;
(2)如图2,求
的值;
(3)如图3,
,
,若
从图1
逆时针旋转到图3时,直接写出点
的运动路径长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeb1aa7bc4a01962fc1297f17fa9128f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://img.xkw.com/dksih/QBM/2021/5/22/2726278172868608/2729203321397248/STEM/a7b626a8-ac5c-400e-80da-64109e57c05c.png)
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c96cb3ac8290e09c55d4eb336a8608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4598486f8c5ac28b1165b76e78105979.png)
(2)如图2,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4d4b4f508b7ab4e842831777d5f68a8.png)
(3)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cf714ffb3fd5917a76b191640b55fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b595d79500a636363ec2455adb55d8ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
名校
【推荐1】在菱形
中,
,
,动点
从
点出发沿线段
以每秒钟1个单位的速度向
点运动(到达
点后停止),设点
运动时间为
,将点
绕着点
顺时针旋转
,得到对应点
,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/29a74040-5b53-4a30-beee-c3b6150b7bdb.png?resizew=514)
(1)如图1,求证:
;
(2)如图2,连接
,若
与△
相似,求
的值;
(3)若点
关于直线
的对称点
在菱形的边上,请直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c26ed4600cef25f040caa553ac21051.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2684b10100be43f77a13fa0ccd1c1d72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a89638d4a4e6dc787ec2e3461c273fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/29a74040-5b53-4a30-beee-c3b6150b7bdb.png?resizew=514)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bceef8a3f331812680b1590182a827f4.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ada5b725eb3be036a2dd999bd613307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f216bdf0ff1340c1209c6503e1946d5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42198b8e646ccfbbec323fd364c4d90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39e210795a966bd5dc1293479ab1988b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
【推荐2】如图,四边形
中,
,
,
,点M,N分别是边
上的动点,且
,
与对角线
分别交于点P,Q.
,
,
① 填空:
______.
② 若
,求
的度数.
③ 在点M,N的运动过程中,
的比值是否发生变化?若不变,请求出这个值;若变化,请说明理由.
(2)如图2,若
,
,直接写出
______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a651eb577dbada1f29590e558d6f9fa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3798a74058ec4bc40b6d9b5d268c359b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/137717f0e360e82319ced7e3a6c69b2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6346735747fe509fa58c2f9ff61ccaf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c1bae33cb0d048f2fcd4fed74d42e4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b59ab6bf6111dda4a3d428454768b77.png)
① 填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb2ed09ace5d37ef555cd9de5b9bbc6d.png)
② 若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5cf2ffcbb7b7bd9be5e65e8003df2c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b18578bc75bf971b8337c35a2db5fea.png)
③ 在点M,N的运动过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/586f7796f6bd90df3f798edf8c39b6a0.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2aeee5320aae7818cd11c84cc632642f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6ab64af35215ed9efdd6571e440acbb.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐1】如图,矩形
中,
厘米,
厘米,点E从A出发沿
向B匀速运动,速度为1厘米/秒;同时,点F从C出发沿对角线
向A匀速运动,速度为1厘米/秒,连接
,设运动时间为t秒
.请解答以下问题:
?
(2)设
的面积为y,求y关于t的函数
(3)在运动过程中,是否存在某一时刻t,使得
?若存在,求出t的值;若不存在,请说明理由;
(4)求在运动过程中线段
与
和的最小值是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4a5734077dda25a1604262ca08e4f26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91adb04de85df001582a227716bdd7a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d354155f71a1736c1c9186168695edd.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
(3)在运动过程中,是否存在某一时刻t,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74e0212491e4b2d7525de9a87fab3a6d.png)
(4)求在运动过程中线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
【推荐2】如图,在矩形
中,
,点E是
边上一点,连接
,过点E作
交
边于点F,连接
交
于点M.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/2/11c7bcaf-f8a9-407a-a4cf-16994f583bf8.png?resizew=365)
(1)当
时,求证:
;
(2)在(1)的条件下,计算
的值;
(3)当
时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73ba94cec6c03980be9ca03774379fa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/992a19339adac3a2f1aab1fbc11b1c68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/2/11c7bcaf-f8a9-407a-a4cf-16994f583bf8.png?resizew=365)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3636a141ab0dd2cc4c481c6d47cedfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d44e961846857b623388589fc518956e.png)
(2)在(1)的条件下,计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e856814d971e57a21a3cd6348360538.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/876bb8ce0ca53475fa091ffd18bdc94a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
您最近一年使用:0次