【问题探究】
(1)如图1,在四边形中,
,点
为
上一点,连接
,求证:
;
(2)如图2,在四边形中,
,点
为
上一点,连接
,
,试判断
与
之间的数量关系,并说明理由;
【问题解决】
(3)如图3,四边形是赵叔叔家的果园平面示意图,点
为果园的一个出入口(点
在边
上),
为果园内的两条运输通道(通道宽度忽略不计),经测量,
,
米,赵叔叔计划在
区域内种植某种果树,并沿
修建一条安全栅栏,为提前做好修建安全栅栏的预算,请你帮赵叔叔计算出
的长度.
更新时间:2024-03-31 10:18:06
|
相似题推荐
解答题-问答题
|
较难
(0.4)
【推荐1】如图,在平面直角坐标系中,已知直线
分别交
轴、
轴于点
,直线
分别交
轴、
轴于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/c6d31646-2041-4ef4-8b34-d73a118fd9ad.png?resizew=374)
备用图
(1)求线段
的中点坐标;
(2)若点
是直线
上的一点,连接
,若
,求点
的坐标;
(3)在(2)的条件下,若点
在第一象限内,以
为顶点作
,射线
交
轴于
.求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/812eed46a589bde8b7c78a81a8cf9b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bd0dd9cd31e3bbc3a84ca8559767adb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b5062be5cf27ae8089ad0c25d1b7c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d65f378feaa13b9a6ae7660e5d09a486.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/c6d31646-2041-4ef4-8b34-d73a118fd9ad.png?resizew=374)
备用图
(1)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca2db35c7791b55e23f49bc3c117fb47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(3)在(2)的条件下,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b9bbd5000bf694f8bac3a5773615b4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438f34bc8b04e8c494b91306ac6fe352.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
您最近一年使用:0次
解答题-作图题
|
较难
(0.4)
【推荐2】如图,在正方形
中,点
是边
上的一动点(不与点
重合),连接
,点
关于直线
的对称点为
,连接
并延长交
边于点
,连接
,
.
与
的数量关系并证明;
(2)过点
作
于点E,交
的延长线于点
,连接
.
直接写出
的形状;
用等式表示线段
,
的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae6f48b9a53c0155a692509cf31f7e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.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/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1a1c4401de116d394ea1aba543d036e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866cc1338e97301f40110f0e65e20e9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f44ca79d5e12bd02c393ba7f0b31c8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
【推荐1】在平面直角坐标系
中,若点P和点
关于y轴对称,点
和点
关于直线l对称,则称点
是点P关于y轴、直线l的“二次对称点”.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/7/f8599617-902a-4361-911c-1168d5712faf.png?resizew=380)
(1)若点
,直线l是经过
且平行于x轴的一条直线,则点P的“二次对称点”的坐标为______;
(2)如图1,点
是x轴正半轴上的一个动点,直线l经过原点且与x轴正半轴的夹角为
,若点B是点A关于y轴,直线l的“二次对称点”,求线段
的长度(用含a的代数式表示);
(3)如图2,
是x轴上的动点,线段
经过点T,且点R、点S的坐标分别是
,
,直线l经过
且与x轴夹角为60°,在点T的运动过程中,若线段
上存在点N,使得点
是点N关于y轴,直线l的“二次对称点”,且点
在y轴上,则点
纵坐标y的取值范围是______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9cb8e6ff801523b0304576cd69fd2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9cb8e6ff801523b0304576cd69fd2d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/7/f8599617-902a-4361-911c-1168d5712faf.png?resizew=380)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/328aaba77106396d4ca644c8b7a352e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7160d93f92089ef36f3dab809d3114b8.png)
(2)如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c240561788bc63f41a6703219fb66d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e15d188f2c16bd519fba975c4a86db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08cce6cac0fdd4b1a434af8bcaec8fef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a14aea95a010cd9e03bb794551629.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daaf8ceec347a4ba9a430b620805c4b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7160d93f92089ef36f3dab809d3114b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08cce6cac0fdd4b1a434af8bcaec8fef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28b1ba4307cfde9b424d468bfcdf6c5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28b1ba4307cfde9b424d468bfcdf6c5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28b1ba4307cfde9b424d468bfcdf6c5a.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】学完平移与旋转后,数学老师再次介绍了截长补短法:截长补短法是初中几何题中一种添加辅助线的方法,也是把几何题化难为易的一种策略.截长就是在长边上截取一条线段与某一短边相等,补短就是通过延长或者旋转等方式使两条短边拼合到一起,从而解决问题.
例如:如图1,已知点P是
的平分线上一点,点A是射线
上任意一点,在
上截取B点,使
(截长法),连接
,易得:
.如图2,已知
中,
平分
,延长
至点F(补短法),使得
,连接
,易得
.
问题情境:
今天我们继续运用截长补短法进行探究学习.如图3,点P是等边
外一点,连接
且满足
,线段
之间有何等量关系呢?
经过探究,勤奋小组讲解了他们的思路:
如图4,在
上截取一点Q,使
,连接
.
∵
是等边三角形,
∴
,
又∵
,∴
,
又∵
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2484c1477fa83fca1804f9023c39e8d5.png)
∴
(依据1: )
∴
,
∴
,即![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d062149edc16b3903f3c11c4f37e3f79.png)
可知
是等边三角形(依据2: ),所以
,因此最终得出线段
之间的等量关系是 .
反思交流:
(1)①上述证明过程中“依据1”“依据2”分别指什么?
依据1: .
依据2: .
②图3中线段
之间的等量关系是 .
探索发现:
(2)创新小组受勤奋小组的启发,把点D移动到边
下方,如图5,
是等边三角形,且点D是边
下方一点,
,将
绕点A逆时针旋转
得到
,根据上述解题思路,继续探究三条线段
之间的等量关系,并写出你的证明过程.
问题解决:
(3)请你参考上面的解题思路,探究并解决下列问题:如图6,在正方形
内有一点P,且
,
,
则
= .
例如:如图1,已知点P是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5766ce341d78da2b770978b831684203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6cb9d714fc2c184cb480acbcbc1e32a.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/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfa3115a985b37d25d325836409c7766.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e43b0cc26f0429c4bde687b64ec15cce.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/19/f4e0ed3f-a82e-4a44-b599-1d3c432b0a3c.png?resizew=835)
问题情境:
今天我们继续运用截长补短法进行探究学习.如图3,点P是等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3eefcf83fef8ae77a55f298967a8a29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60faf3a9bc2daab1f386ec116d74b703.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92c7267e5313b9b00ef22c94a479fc34.png)
经过探究,勤奋小组讲解了他们的思路:
如图4,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b488810d70e10e03753663a07a812a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00696f6c25576d448d15c7c9ea13037a.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60faf3a9bc2daab1f386ec116d74b703.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baf6b4037459f820a9833bb2174e9165.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0bd8869f34219e7fbe5a9b8842667c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2484c1477fa83fca1804f9023c39e8d5.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59e49fc3110ba8df05c342a21fc7e3eb.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c3612ca8454dd706ec6af42b54db15.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c8f0d030afec79e7f9d86accf3204c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d062149edc16b3903f3c11c4f37e3f79.png)
可知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7c19423b263c5c2f1b29e5952b0a7c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92c7267e5313b9b00ef22c94a479fc34.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/19/14b35581-bd71-486d-a3d9-f3a5695a5b12.jpg?resizew=362)
反思交流:
(1)①上述证明过程中“依据1”“依据2”分别指什么?
依据1: .
依据2: .
②图3中线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92c7267e5313b9b00ef22c94a479fc34.png)
探索发现:
(2)创新小组受勤奋小组的启发,把点D移动到边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bcf905f3910d9238a44ef647835b3d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61537fc86d98a5a52e0b67d70cf76a90.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/19/bdddf3a4-5f0e-4c03-b2b1-4dc9a8495bc3.jpg?resizew=420)
问题解决:
(3)请你参考上面的解题思路,探究并解决下列问题:如图6,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3ad66112b09c909cab417085702ec00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26a42b05e06fe34d66538930787bb3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5064f5ce5ac8428e277fd578da84ec6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0433f8116768b42642a7f7e5977ce6.png)
您最近一年使用:0次
解答题-计算题
|
较难
(0.4)
【推荐1】如图,在平面直角坐标系
中,直线
分别交x轴,y轴于A,B两点,经过A,B两点的抛物线
与x轴的正半轴相交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/6/8c2999c1-2ee4-473c-95cf-e8e722e532cf.png?resizew=187)
(1)求抛物线的解析式;
(2)点D在第二象限的抛物线上,且
与
面积相等,求D点坐标;
(3)若P为线段
上一点,
,求
的长;
(4)在(3)的条件下,设M是y轴上一点,试问:抛物线上是否存在点N,使得以A,P,M,N为顶点的四边形为平行四边形?若存在,直接写出点N的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/023ab3a7eb0f59993c7608576e47c0f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a65d8ff9318909d18b6e1c76f90d61f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/6/8c2999c1-2ee4-473c-95cf-e8e722e532cf.png?resizew=187)
(1)求抛物线的解析式;
(2)点D在第二象限的抛物线上,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/372629a8666de1e9bac3e7daadcac7b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)若P为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0614bcec329b374186c1fb0e392de144.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
(4)在(3)的条件下,设M是y轴上一点,试问:抛物线上是否存在点N,使得以A,P,M,N为顶点的四边形为平行四边形?若存在,直接写出点N的坐标;若不存在,请说明理由.
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
名校
【推荐2】如图1,四边形
内接于
,
,点C在
上,
于点F.
(1)连接
,求证:
.
(2)设
为x度,
为y度,写出y关于x的函数表达式.
(3)如图2,作
于点G,连接
并延长交
于点H.
①
,
,
,求
的长.
②若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3a079cfdcca9acdacecbf08f9f78cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a277db452e76240ec83ec6a2864bdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/26/8a4e75e4-9e70-4ff9-b212-9e090899da45.png?resizew=263)
(1)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d98f7fdc2d2dfec0265e31a42db66e.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d59511c474942171fb685fc3f8dfd2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060705794ef87cc71dac40c57f27b1d2.png)
(3)如图2,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c17b89160163de99bfdc3f2676be5da9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05671b2703194270861dd5ca292627bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2cfc6b567a99050085d6188b190679b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4974c031cb2fdf0b946ed0712ff6a50e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ee4f58ec0a81d46ff0557b9220ba606.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307bd991211ec79b47a4be52933bb8e7.png)
您最近一年使用:0次