如图,
是
直径,弦
于点E,过点C作
的垂线
, 垂足为点F,延长
交
的延长线于点G,连结
.
(1)求证:
;
(2)若
,求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/8/fec64799-d2e2-40c3-bf45-d4edbde1e929.png?resizew=174)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/139bb4704fedc97e2ce958b8038c0e58.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c037431f715d76ef3d7c1763484923a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
更新时间:2023-05-21 22:53:23
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】已知,
是
的直径,
是
的切线,点P是切点,
的延长线交
于点D,过点B作
于C,连接
.
, 求
的度数;
(2)如图2,
与
交于E,若E是
的中点,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd6a2b112facda441f4e34bf5c145fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37a9d4526ddf01eb414b7257661799b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a91f89a0bc06bd1613e4ec4011e6755.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d31f270ce8ad3a1760125ed5a2752bef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc64621fd590f1b1a0e83509401494f1.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,在
中,
,以
为直径作
交
于点
,过点
作
的垂线交
于点
,交
的延长线于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/9e58f746-a6b1-41c5-858b-95eb0eba66d3.png?resizew=201)
(1)求证:
与
相切;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/9e58f746-a6b1-41c5-858b-95eb0eba66d3.png?resizew=201)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4a35c74cc181f1693e7720a3a562d1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86338536656046e93b53672ade9a78b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图,在
中,
,
,点D是
边的中点,连结
.作
,
,
与
相交于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/e5f3e41a-e4e8-44b1-b4b2-a0036619225a.png?resizew=144)
(1)求证:四边形
是矩形.
(2)四边形
的面积为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c8817091d0f4b7d7ac6df560cb63c68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e932b4add3175358f15be0e1f7104e79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec5d3a183594be47dd6e386d2c9d725.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/e5f3e41a-e4e8-44b1-b4b2-a0036619225a.png?resizew=144)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bc1cbcd6d00f0c36bad8254297d9f33.png)
(2)四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ff27eea7545bb06f9472f91290c54e.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,在
中,
两点分别在边
上,连接
, 且
.
为平行四边形;
(2)若
平分
,
,且
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a373959bb9026f8a09845c0b828bf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9b79c80cc81b5446dfac3ee97b03c03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdb6adf7bcf18b5e48293c91537f9cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a067e1d68b4751430cbf096e00b80a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f3c15b30bd155641e548a7d8c172dd4.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bb79c82e2ecee4cce178f5e9d79d39e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,
内接于
,
是直径,过点
作直线
,且
.
![](https://img.xkw.com/dksih/QBM/2021/12/13/2871773094453248/2873039411159040/STEM/a4519bc0cb604b5fb3478f07d4b2e238.png?resizew=154)
(1)求证:
是
的切线.
(2)设
是弧
的中点,连结
交
于点
,过点
作
于点
,交
于点
.
①求证:
.
②若
,
,试求
的长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a3b2f85cf524bb79751d97adb3c2336.png)
![](https://img.xkw.com/dksih/QBM/2021/12/13/2871773094453248/2873039411159040/STEM/a4519bc0cb604b5fb3478f07d4b2e238.png?resizew=154)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a2750cf18d5df088ec6320cb5300c9a.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e3fe36b9961265df2f04c33e8e17be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/598dd4cc547f36671848ea6cab2b6f1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,在
中,
,以
为直径的
与
交于点
为
上一点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/620064bf-a453-4646-9228-55636f6e3f8d.png?resizew=165)
(1)求
的长;
(2)若
,判断直线
与
的位置关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54c3ca2fb4102e8ac86cfd1bad6ced5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3648c864f9f58da1dbb166fee84cfeaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4518d799c5b3220648fc5d91c14ca59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38eadce598b093e9a09344b7a6ce4bc0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/620064bf-a453-4646-9228-55636f6e3f8d.png?resizew=165)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8192018a58bb1fe23769a48a4d9042ed.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2de291fff024e21b4d8e8f0b4f9fb81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
真题
【推荐1】如图,△ABC中,点E、P在边AB上,且AE=BP,过点E、P作BC的平行线,分别交AC于点F、Q.记△AEF的面积为
,四边形EFQP的面积为
,四边形PQCB的面积为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://img.xkw.com/dksih/QBM/2015/7/8/1573866555539456/1573866562002944/STEM/7f91bd51bb5a43b5b1a2a38d6a77851a.png)
(1)求证:EF+PQ=BC
(2)若
+
=
,求
的值
(3)若
-
=
,直接写出
的值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://img.xkw.com/dksih/QBM/2015/7/8/1573866555539456/1573866562002944/STEM/7f91bd51bb5a43b5b1a2a38d6a77851a.png)
(1)求证:EF+PQ=BC
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://img.xkw.com/dksih/QBM/2015/7/8/1573866555539456/1573866562002944/STEM/5cca11328ad64c69b6538bf06638f853.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://img.xkw.com/dksih/QBM/2015/7/8/1573866555539456/1573866562002944/STEM/5cca11328ad64c69b6538bf06638f853.png)
您最近一年使用:0次
解答题-计算题
|
适中
(0.65)
名校
【推荐2】请阅读下列科普材料,并完成相应的任务.
图算法是根据几何原理,将某一已知函数关系式中的各变量,分别编成有刻度的直线(或曲线),并把它们按一定的规律排列在一起的一种图形,可以用来解函数式中的未知量.比如想知道10摄氏度相当于多少华氏度,我们可根据华氏温度F与摄氏温度C之间的关系:
得出,当
时,
.但是如果你的温度计(如图①)上有华氏温标刻度,就可以从温度计上直接读出答案,这种利用特制的线条进行计算的方法就是图算法.
再看一个例子:如图②,设有两只电阻,
千欧,
千欧,问并联后的总电阻值R是多少千欧?
我们可以利用公式:
求得R的值,也可以设计一种图算法(如图③)直接得出结果:我们先来画出一个120°的角,再画一条角平分线,在角的两边及角平分线上用同样的单位长度进行刻度,这样就制好了一张算图.我们只要把角的两边刻着
千欧和
千欧的两点连成一条直线,这条直线与角平分线的交点的刻度值就是并联后的总电阻值R.
图算法得出的数据大多是近似值,但在大多数情况下是够用的,那些需要用同一类公式进行计算的测量制图人员,往往更能体会到它的优越性.
![](https://img.xkw.com/dksih/QBM/2022/4/28/2975051256356864/2980629199273984/STEM/e4e02d18-739f-4ae7-9eb6-e50c0d3e70c8.png?resizew=59)
![](https://img.xkw.com/dksih/QBM/2022/4/28/2975051256356864/2980629199273984/STEM/593dec4d-9f54-4c77-8ba9-ea8b62359352.png?resizew=192)
![](https://img.xkw.com/dksih/QBM/2022/4/28/2975051256356864/2980629199273984/STEM/6de8e718-f3e7-4f36-a362-3875bef1dbb2.png?resizew=224)
任务:
(1)请根据以上材料简要说出图算法的优越性:
(2)①用公式
计算:当
千欧,
千欧时,
的值为多少千欧?
②如图③,
,OC是
的角平分线,
,
,
,用你所学的几何知识说明:
.
图算法是根据几何原理,将某一已知函数关系式中的各变量,分别编成有刻度的直线(或曲线),并把它们按一定的规律排列在一起的一种图形,可以用来解函数式中的未知量.比如想知道10摄氏度相当于多少华氏度,我们可根据华氏温度F与摄氏温度C之间的关系:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c0f908ffe021bf2bd4a784213f9aa13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c72bd2d81cbc0db354f9ad9f0792a71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d59dc5f572a50e7bc5be413a38008d16.png)
再看一个例子:如图②,设有两只电阻,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6530ef698b87414f27d25d066f64904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a968a1860f6c010cf5246fc281f83073.png)
我们可以利用公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80d2cdc7b545f61c01ef0fe698bac83a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6530ef698b87414f27d25d066f64904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a968a1860f6c010cf5246fc281f83073.png)
图算法得出的数据大多是近似值,但在大多数情况下是够用的,那些需要用同一类公式进行计算的测量制图人员,往往更能体会到它的优越性.
![](https://img.xkw.com/dksih/QBM/2022/4/28/2975051256356864/2980629199273984/STEM/e4e02d18-739f-4ae7-9eb6-e50c0d3e70c8.png?resizew=59)
![](https://img.xkw.com/dksih/QBM/2022/4/28/2975051256356864/2980629199273984/STEM/593dec4d-9f54-4c77-8ba9-ea8b62359352.png?resizew=192)
![](https://img.xkw.com/dksih/QBM/2022/4/28/2975051256356864/2980629199273984/STEM/6de8e718-f3e7-4f36-a362-3875bef1dbb2.png?resizew=224)
任务:
(1)请根据以上材料简要说出图算法的优越性:
(2)①用公式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80d2cdc7b545f61c01ef0fe698bac83a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6530ef698b87414f27d25d066f64904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a968a1860f6c010cf5246fc281f83073.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
②如图③,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ff5c21185c13eae675906dabd3593c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e688c8fdc11bc0b438d4260bb9ea2867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e37c8984ec68b97242a74e9f4bb5f739.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ca2611771ca8449b964b7bac8bf96ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80d2cdc7b545f61c01ef0fe698bac83a.png)
您最近一年使用:0次