如图,在平面直角坐标系中,直线
交x轴于点
,交y轴于点
,直线
经过点B且交x轴正半轴于点C,已知
.
(1)点C的坐标是(______,____),直线
的表达式是______;
(2)如图1,点E为线段
中点,点D为y轴上一动点,以
为直角边作等腰直角三角形
,且
,当点F落在直线
上时,求点D的坐标;
(3)如图2,若G为线段
上一点,且满足
,点M为直线
上一动点,在x轴上是否存在点N,使以点B,C,M,N为顶点的四边形为平行四边形?若存在,请直接写出点N的坐标;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3062f849b63c50d8f7a09d66b019c33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0778521d4a21256d81519ac424d36d1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad4c0ba3a6750537789844d0ec419d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/2/ee080534-9b47-4e38-ae87-9f0dc2364ae6.png?resizew=322)
(1)点C的坐标是(______,____),直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)如图1,点E为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5447a70b9197de4d2814c227a33b42fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7faabc484ce3666706c1beffda4bcfe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)如图2,若G为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a54bdcc9358cb144c168644153a53763.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
更新时间:2023-06-28 13:16:06
|
相似题推荐
解答题-问答题
|
困难
(0.15)
【推荐1】如图,二次函数
(m是常数,且
)的图象与
轴相交于点
、
(点
在点
的左侧),与
轴相交于点
,动点
在对称轴
上,连接
、
、
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/15/d8f55fdf-0e5b-403c-ac1e-49f265847e0b.png?resizew=167)
(1)求点
、
、
的坐标(用数字或含
的式子表示);
(2)当
的最小值等于
时,求
的值及此时点
的坐标;
(3)当
取(2)中的值时,若
,请直接写出点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb11f62e095293792496484dce6f9b9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/15/d8f55fdf-0e5b-403c-ac1e-49f265847e0b.png?resizew=167)
(1)求点
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a51a8d10345f567e0f2daf18529d42f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/588c3822b7812e711b4ad86647b15dc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7021cf14b4f0c181a90fec967be7244.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
名校
【推荐2】在平面直角坐标系
中,已知矩形OABC,其中点
,给出如下定义:若点P关于直线
的对称点
在矩形OABC的内部或边上,则称点P为矩形OABC关于直线l的“关联点”.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/24/c024e08d-d0d0-4309-bc5f-483f8059cf18.png?resizew=639)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/24/48c1fc6a-94bf-4c5d-ad97-5c44a2f505dd.png?resizew=636)
例如,图1中的点D,点E都是矩形OABC关于直线
的“关联点”.
(1)如图2,在点
中,是矩形OABC关于直线
的“关联点”的为_____________;
(2)如图3,点
是矩形OABC关于直线
的“关联点”,且
是等腰三角形,求t的值;
(3)若在直线
上存在点Q,使得点Q是矩形OABC关于直线
的“关联点”,请直接写出b的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06727b3c6f24e7f8b500e2c0d113b5c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d6606fdba2fcc22c553e830534f7987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/24/c024e08d-d0d0-4309-bc5f-483f8059cf18.png?resizew=639)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/24/48c1fc6a-94bf-4c5d-ad97-5c44a2f505dd.png?resizew=636)
例如,图1中的点D,点E都是矩形OABC关于直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cd2055d628b270d50e1f37b3752aee2.png)
(1)如图2,在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6bd522db7b22106b0c753c61318c2e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3aab32903fc13d099bf398366be37fb.png)
(2)如图3,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048d44c756b8c515330eeb2ce69a65a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d6606fdba2fcc22c553e830534f7987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d961bdb5e4dfd25ed262634116664c2f.png)
(3)若在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87490be8d0cdb7bc6c39d1a37f3bc335.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3aab32903fc13d099bf398366be37fb.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,抛物线
经过点
,
,与
轴正半轴交于
点,与
轴交于
点.
(1)求直线
的解析式;
(2)设点
为直线
下方抛物线上一点,连接
、
,当
面积最大时,求点
的坐标;
(3)在(2)的条件下,直线
过直线
与
轴的交点
.设
的中点为
,
是直线
上一点,
是直线
上一点,求
周长的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f17d9822e61fb68725d9a9de7debcd9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/226f0ba42e3027a9f2de6bb4acd42dd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cf9dc012c88456de7e1d26c7515a538.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63ab13ef156d034b710d811e09b0be34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)在(2)的条件下,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07565f10847840e0fb07b05218ad17fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07565f10847840e0fb07b05218ad17fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661df2b51130e249080316ac1a768ac7.png)
![](https://img.xkw.com/dksih/QBM/2018/5/8/1940869164711936/1941672858492928/STEM/ee2fe2bca0eb420c9a699d406b4136b7.png?resizew=246)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
名校
解题方法
【推荐2】如图1,在平面直角坐标系中,二次函数
的图象经过点
,过点A作
轴,作直线AC平行x轴,点D是二次函数
的图象与x轴的一个公共点(点D与点O不重合).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/1/856459fa-748d-428b-a131-825989bb061e.png?resizew=646)
(1)求点D的横坐标(用含b的代数式表示)
(2)求
的最大值及取得最大值时的二次函数表达式.
(3)在(2)的条件下,如图2,P为OC的中点,在直线AC上取一点M,连接PM,作点C关于PM的对称点N,①连接AN,求AN的最小值.
②当点N落在抛物线的对称轴上,求直线MN的函数表达式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee7929e6d652d5f6f38538c5fdc1e610.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19020a900db99260ece282df0b1408d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24624dffd30b66a5e4de57362b32b2a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee7929e6d652d5f6f38538c5fdc1e610.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/1/856459fa-748d-428b-a131-825989bb061e.png?resizew=646)
(1)求点D的横坐标(用含b的代数式表示)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f891f9e82b44c063071690143429607.png)
(3)在(2)的条件下,如图2,P为OC的中点,在直线AC上取一点M,连接PM,作点C关于PM的对称点N,①连接AN,求AN的最小值.
②当点N落在抛物线的对称轴上,求直线MN的函数表达式.
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】在平面直角坐标系中,O为坐标原点,直线
交x轴的负半轴于点A交y轴的正半轴于点B,
,点C在x轴的正半轴上,
.
![](https://img.xkw.com/dksih/QBM/2021/3/22/2683324223619072/2683940302929920/STEM/db326d42-46a6-40b2-865d-dee22077684b.png)
(1)如图1,求直线
的解析式;
(2)如图2,点D在第四象限的直线
上,
于点E,
,求点D的坐标;
(3)如图3,在(2)的条件下,点F在线段
上,点G在线段
上,射线
交直线
于点H,若
,求点H的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07565f10847840e0fb07b05218ad17fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c406e7d1e7977dd5b30ef81cfdc8e8d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df7651a269eb58e8baa22f2e0cd43efc.png)
![](https://img.xkw.com/dksih/QBM/2021/3/22/2683324223619072/2683940302929920/STEM/db326d42-46a6-40b2-865d-dee22077684b.png)
(1)如图1,求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)如图2,点D在第四象限的直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a130e7c109e2196b97e1a76281bf3cf6.png)
(3)如图3,在(2)的条件下,点F在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/693fea966a368ca3aa8ab15ca07f7fe7.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐2】如图1,二次函数
与x轴交于点A(﹣2,0)、点B(点A在点B左侧),与y轴交于点C(0,3),
.
![](https://img.xkw.com/dksih/QBM/2022/3/14/2943026792931328/2943152321798144/STEM/8a946235-928b-4057-9592-f8b35943332e.png?resizew=579)
(1)求二次函数解析式;
(2)如图2,点P是直线BC上方抛物线上一点,PD∥y轴交BC于D,PE∥BC交x轴于点E,求PD+BE的最大值及此时点P的坐标;
(3)在(2)的条件下,当PD+BE取最大值时,连接PC,将
绕原点O顺时针旋转
至
;将原抛物线沿射线CA方向平移
个单位长度得到新抛物线,点M在新抛物线的对称轴上,点N为平面内任意一点,当以点M,N,
,D′为顶点的四边形是矩形时,请直接写出点N的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ceb0cd6bd9b3f883ed957628ceb69054.png)
![](https://img.xkw.com/dksih/QBM/2022/3/14/2943026792931328/2943152321798144/STEM/8a946235-928b-4057-9592-f8b35943332e.png?resizew=579)
(1)求二次函数解析式;
(2)如图2,点P是直线BC上方抛物线上一点,PD∥y轴交BC于D,PE∥BC交x轴于点E,求PD+BE的最大值及此时点P的坐标;
(3)在(2)的条件下,当PD+BE取最大值时,连接PC,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5659cf1e7b89090f313f735ef5b291d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/877d67c8decbb7aa0991978b2edfd57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/700762875cb4f15b556a72f10a42ac9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
【推荐1】(Ⅰ)求证:平行四边形
的对角线长的平方和等于四条边长的平方和.即
.
(Ⅱ)平面内三个动点
满足
,且
到定点
的距离分别为
.求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d19e1fe90cccccbacb99b2fa94ae25b.png)
(Ⅱ)平面内三个动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38335830b93ac4d99c28a8e209eecb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38335830b93ac4d99c28a8e209eecb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab90f04b5141768433337dd9e991e80f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
名校
【推荐2】【探究与应用】
我们把平行四边形沿着它的一条对角线翻折,会发现有很多结论.例如:在平行四边形
中,
,将
沿直线
翻折至
,连接
,则
.
与
相交于点O,证明以上这个结论;
小明同学提出如下解题思路,请补全:
【思路分析】
由折叠的性质得
,
;由平行四边形的性质得______,
.由上面的分析可证得
,______,这样就可以得到
,则______,再由等腰三角形的性质得
,证出
,即可得出结论;
(2)如图2,
与
相交于点O,若
,
,
,则
的面积为______;
(3)如果
,
,
①当
是直角三角形时,请画图并直接写出
的长.
②设
的长度为x,当
时,直接写出 x的取值范围.
我们把平行四边形沿着它的一条对角线翻折,会发现有很多结论.例如:在平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a320a6a242be91347d1b241f6313251.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80651f797ab9dccfd7163c605b091ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d1e679d83e4675cdef9b81a62c53f21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
小明同学提出如下解题思路,请补全:
【思路分析】
由折叠的性质得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/082811d4f5d199b0b5a5fd259e267a8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8915b7d1abc441d76c7485628219d71f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a46310f3431c0a78842751c83f89753d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a23f35ebcd9799d82c1e41c09781a4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dedee58b1338be6e2f552829b5b9f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15941430a549cbc8563e8b50d53e58c7.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ea52361458ce2e49ed0fe99d8e6c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bbf9680f74a9ac5d934304654ce2771.png)
(3)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c771a4feb150ad9cff8d70431c97eb17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
②设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a2bb3e92634857d82126748c70443a1.png)
您最近一年使用:0次