解题方法
1 . 在
中,
,
,AB的垂直平分线分别交AB,AC于D、E(图一),沿DE将
折起,使得平面
平面BDEC(图二).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/5f7ad44c-cc5e-4c77-9973-27d4d74c386e.png?resizew=370)
(1)若F是AB的中点,求证:
平面ADE.
(2)P是AC上任意一点,求证:平面
平面PBE.
(3)P是AC上一点,且
平面PBE,求二面角
的大小.
![](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/ab926d89b65f26c12e3da73ef1e5cf68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/5f7ad44c-cc5e-4c77-9973-27d4d74c386e.png?resizew=370)
(1)若F是AB的中点,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94270844f197d524bf1da4f1385befd2.png)
(2)P是AC上任意一点,求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17580410bf63dba4fe164265afaac4cc.png)
(3)P是AC上一点,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8efa92fbb689ce6f9ab3384918f48774.png)
您最近一年使用:0次
名校
解题方法
2 . 如图,四棱锥E﹣ABCD的侧棱DE与四棱锥F﹣ABCD的侧棱BF都与底面ABCD垂直,
,
//
,
.
![](https://img.xkw.com/dksih/QBM/2020/3/2/2410737436590080/2412398469545984/STEM/426907cc-7716-45c0-82c6-d9b05f14013e.png)
(1)证明:
//平面BCE.
(2)设平面ABF与平面CDF所成的二面角为θ,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb2dd10731b99c0f4f89ee957f8a239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efdaef8d473c2deb6f4ca52e8fd9df0b.png)
![](https://img.xkw.com/dksih/QBM/2020/3/2/2410737436590080/2412398469545984/STEM/426907cc-7716-45c0-82c6-d9b05f14013e.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(2)设平面ABF与平面CDF所成的二面角为θ,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5ff5a2e7663e6a21ccea3149a10113.png)
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2020-03-04更新
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1221次组卷
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7卷引用:辽宁省沈阳市第二中学2020届高三下学期第五次模拟考试数学(理)试题
名校
解题方法
3 . 如图,在三棱柱
中,已知四边形
为矩形,
,
,
,
的角平分线
交
于
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/67de05d6-5add-48d7-9d79-f9eb9e78e212.png?resizew=269)
(1)求证:平面
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51d0fdc5a00ca0e857b89a7e1420df29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a566b100fb2ebe3d208f9b6527934218.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05f19a857a2f4224d2f2574f9bf290d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f095da440cbb236e433a05817a25e20e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/67de05d6-5add-48d7-9d79-f9eb9e78e212.png?resizew=269)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/049772598ec72ffc4d5d47f11c97bf4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/058fff86f341ccaa93c75cc9f3015632.png)
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2020-02-12更新
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1253次组卷
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8卷引用:辽宁省大连市第二十四中学2020届高三6月高考模拟(最后一模)数学(理)试题
名校
4 . 如图,直三棱柱
中,
,
,
,
分别为
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/04995d23-7b87-42b4-af22-6ed033682091.png?resizew=163)
(1)证明:
平面
;
(2)已知
与平面
所成的角为30°,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/883fc5e3faf39829d60804b59deb1730.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/04995d23-7b87-42b4-af22-6ed033682091.png?resizew=163)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d2d217e9bcd059908f117dfc4d4259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319d234a0586478d4e73020d48b3a10.png)
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2020-05-13更新
|
2759次组卷
|
16卷引用:【市级联考】辽宁省丹东市2019届高三总复习质量测试(一)理科数学试题
【市级联考】辽宁省丹东市2019届高三总复习质量测试(一)理科数学试题四川省广安市广安中学2019-2020学年高二9月月考(文)数学试题黑龙江省鹤岗市第一中学2019-2020学年高三上学期10月月考数学(理)试题江西省吉安市2019-2020学年高三上学期期中数学(理)试题江西省宜春市上高县第二中学2019-2020学年高三上学期11月月考数学(理)试题湖北省襄阳市2019-2020学年高二上学期期末数学试题2020届河北省衡水中学高三年级上学期五调考试数学(理科)试题2020届黑龙江省实验中学高三上学期期末考试数学(理)试题四川省棠湖中学2019-2020学年高三下学期第二次月考数学(理)试题(已下线)专题01 平行、垂直问题的证明(第三篇)-备战2020年高考数学大题精做之解答题题型全覆盖山东济南市历城第二中学2019-2020学年高一下学期开学考试数学试题江苏省无锡市江阴市高级中学2019-2020学年高二下学期期中数学试题2020届河北省衡水中学高三高考考前密卷(一)数学(理)试题湖北省宜昌市天问高中2019-2020学年高二(下)开学数学试题人教B版(2019) 选择性必修第一册 过关斩将 第一章 空间向量与立体几何 1.2 空间向量在立体几何中的应用 1.2.4 二面角甘肃省永昌县第一中学2020-2021学年高三上学期第一次月考数学理试题
5 . 如图,在三棱柱
中,
平面
,
分别是线段
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/d57da5b4-1041-476b-b615-4b3bcdb7c7cc.png?resizew=160)
(1)证明:
平面
;
(2)当三棱柱的各棱长均为2时,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ecf072589c0f901d92f6bda111d841.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/d57da5b4-1041-476b-b615-4b3bcdb7c7cc.png?resizew=160)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b663363459ff3240d834eb778b3b53f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74bca84ad86c648d3bb20c8909c8da3f.png)
(2)当三棱柱的各棱长均为2时,求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1290b2fd10d49337a7420fc368cfea75.png)
您最近一年使用:0次
2020-01-13更新
|
623次组卷
|
2卷引用:2020届辽宁省葫芦岛市高三下学期第一次模拟考试数学(文)试题
6 . 如图,已知
为等边三角形,
为等腰直角三角形,
.平面
平面ABD,点E与点D在平面ABC的同侧,且
,
.点F为AD中点,连接EF.
![](https://img.xkw.com/dksih/QBM/2020/1/9/2373357262274560/2373992314191872/STEM/1d9cb807-8658-47e8-beb9-64f74780d35f.png)
(1)求证:
平面ABC;
(2)求证:平面
平面ABD.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8915e8e775538d41debf1933102c6b86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d7090639341730951c1bc3c9b6164e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03d4224bc2697567f30195aceab0d2b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4b798f9bb5482f0a3cfa1bfd77d245.png)
![](https://img.xkw.com/dksih/QBM/2020/1/9/2373357262274560/2373992314191872/STEM/1d9cb807-8658-47e8-beb9-64f74780d35f.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f16835e3f230ba3f543b6804e445e283.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec43f7352b3a8c194b4c37485fb4ffd8.png)
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2020-01-10更新
|
702次组卷
|
4卷引用:2020年1月辽宁省沈阳市一模数学(文)试题
2020年1月辽宁省沈阳市一模数学(文)试题2020届辽宁省沈阳市高三上学期教学质量检测(一)数学(文)试题2020届辽宁省沈阳市高三教学质量监测(一)文科数学试题(已下线)8.6.3 第2课时 平面与平面垂直(分层练习)-2020-2021学年高一数学新教材配套练习(人教A版2019必修第二册)
7 . 如图,已知
为等边三角形,
为等腰直角三角形,
,平面
平面ABD,点E与点D在平面ABC的同侧,且
,
.点F为AD中点,连接EF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/ce586994-36b5-4197-a5ab-5ee7206d1b9b.png?resizew=127)
(1)求证:
平面ABC;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5e1441a49e782ff0ef46e776cde06a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8915e8e775538d41debf1933102c6b86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d7090639341730951c1bc3c9b6164e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cebb0f4c0bcc418701bd0ebcc96c673.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4b798f9bb5482f0a3cfa1bfd77d245.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/ce586994-36b5-4197-a5ab-5ee7206d1b9b.png?resizew=127)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbeab80976db9b4689b9446cda06196a.png)
您最近一年使用:0次
2020-01-10更新
|
986次组卷
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4卷引用:2020年1月辽宁省沈阳市一模数学(理)试题
2020年1月辽宁省沈阳市一模数学(理)试题2020届辽宁省沈阳市高三上学期教学质量检测(一)数学(理)试题(已下线)专题07 立体几何中的向量方法-备战2021届高考数学(理)二轮复习题型专练?(通用版)河南省郑州励德双语学校2022-2023学年高二下学期第三次考试数学试题
名校
解题方法
8 . 如图,四棱锥
中,四边形
是边长为2的菱形
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/d093e50b-1983-46ea-9a6d-5b393412ae17.png?resizew=203)
(1)证明:平面
平面
;
(2)当平面
与平面
所成锐二面角的余弦值
,求直线
与平面
所成角正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c753cb1eb73fd8d136d00462970797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/190761b52d7e674d952ad4c2c9d1c7a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/d093e50b-1983-46ea-9a6d-5b393412ae17.png?resizew=203)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
(2)当平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/422210c777ac0d625bbd81cc7601bf9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83303d3784492506fc44f2b4d6b07bc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
您最近一年使用:0次
2020-03-19更新
|
651次组卷
|
5卷引用:2019届辽宁省实验中学高三模拟考试数学(理)试题
2019届辽宁省实验中学高三模拟考试数学(理)试题2020届四川省泸县第五中学高三三诊模拟考试数学(理)试题四川省内江六中2020届高三高考数学(理科)强化训练试题(三)(已下线)专题18 立体几何综合-2020年高考数学(理)母题题源解密(全国Ⅰ专版)(已下线)专题15 立体几何解答题全归类(9大核心考点)(讲义)-2
名校
解题方法
9 . 已知点
是抛物线
:
的准线与
轴的交点,点
是抛物线
上的动点,点
、
在
轴上,
的内切圆为圆
:
,且
,其中
为坐标原点.
(1)求抛物线
的标准方程;
(2)求
面积的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7089148c36cb3c39af71de653756396a.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/b1241216f3c1cb5e73043dd1037f556d.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/af2cc5f8cec8c498aa12c99c04e1c97d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e383fcc122f267043fbafe0972bfb900.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17e34d75eb1fefa175a2fa56d64af3bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af2cc5f8cec8c498aa12c99c04e1c97d.png)
您最近一年使用:0次
2020-03-09更新
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661次组卷
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5卷引用:2020届辽宁省辽南协作校高三第二次模拟考试数学文科试题
2020届辽宁省辽南协作校高三第二次模拟考试数学文科试题2020届辽宁省辽南协作校高三第二次模拟数学理科试题辽宁省协作校2020届高三下学期第二次模拟考试数学(文)试题江西省临川第一中学2018-2019学年高二下学期期中数学(理)试题(已下线)专题28 《圆锥曲线与方程》中的内接内切问题-2021-2022学年高二数学同步培优训练系列(苏教版2019选择性必修第一册)
10 . 等腰直角三角形
中,
,
为
的中点,正方形
与三角形
所在的平面互相垂直.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/67666b0f-8990-4000-a144-65c09f79ab1c.png?resizew=220)
(Ⅰ)求证:
平面
;
(Ⅱ)若
,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.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/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/67666b0f-8990-4000-a144-65c09f79ab1c.png?resizew=220)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1c920d02068d0e63ffdab70786c526d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4294ffdba16ae69fd03b13959d682aba.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea848cd2aa3a464618020475097949fc.png)
您最近一年使用:0次
2019-12-30更新
|
1229次组卷
|
5卷引用:辽宁省沈阳市东北育才学校2019-2020学年高三上学期第三次模拟数学(文)试题