解题方法
1 . 在如图所示的几何体中,侧面
为正方形,底面
中,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/9aa4885b-d99d-4fd5-beec-e97d9b1aabd3.png?resizew=190)
(1)求证:
平面
;
(2)线段
上是否存在点
,使
平面
?证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679a911235fae7f028966b57f150ddee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4020513c097ba34df4b42e297f892cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac5867254f6e74a3e31237279cd481f6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/9aa4885b-d99d-4fd5-beec-e97d9b1aabd3.png?resizew=190)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e51817ee1ebf17c73ed21171bcfc5b5.png)
(2)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05a162b0af925d3b18d0f7e2c3b32dcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f4291a7c647aaf6d00e48bed030b48c.png)
您最近一年使用:0次
名校
解题方法
2 . 在
中,
,
,
的对边分别为
,
,
,已知
.
(1)求证:
;
(2)若
,求边
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0957cced5100647e7b6795de8893adeb.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7891e17f36ab33bdc6bdcb6eb5709f9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04959523a28786962d51cfb43a8767d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
您最近一年使用:0次
2023-03-20更新
|
792次组卷
|
2卷引用:江西省抚州市资溪县第一中学2022-2023学年高一下学期5月期中考试数学试题
名校
解题方法
3 . 记
的内角
、
、
的对边分别为
、
、
.已知
.
(1)证明:
;
(2)若
,
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ab46f5c3a111557d38c49e10fa99388.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f296989add06c4bc2207a20b0746e533.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca3c56bef74eb3ba538d9a29fdfa6c13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
2023-03-14更新
|
4934次组卷
|
6卷引用:江西省南昌市江西师大附中2024届高三上学期期中数学试题
名校
4 . 如图,在四棱锥
中,底面四边形
为菱形,点
为棱
的中点,
为边
的中点.
![](https://img.xkw.com/dksih/QBM/2022/11/22/3114997088337920/3116118547111936/STEM/77647d3c898743d48ba9838ccd045301.png?resizew=207)
(1)求证:
平面
;
(2)若侧面
底面
,且
,
,求平面
与平面
的夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](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/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2022/11/22/3114997088337920/3116118547111936/STEM/77647d3c898743d48ba9838ccd045301.png?resizew=207)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc521258fcaeaf7acffc5ae98c3af6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30f457418e6a7e21f0ed0bf490a3709c.png)
(2)若侧面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19d8b7b9ed614cb3537ee4851c8e9d96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3c94c2ec755a12d37ce4ee5764ec355.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30f457418e6a7e21f0ed0bf490a3709c.png)
您最近一年使用:0次
2022-11-24更新
|
740次组卷
|
4卷引用:江西省丰城中学2022-2023学年高一下学期期中数学试题
名校
解题方法
5 . 赵爽是我国古代数学家,他为《周髀算经》一书作序时,介绍了“勾股圆方图”,亦称“赵爽弦图”(以弦为边长得到的正方形由4个全等的直角三角形再加上中间的一个小正方形组成).类比“赵爽弦图”,可构造如图所示的图形,它是由3个全等的三角形与中间一个小等边三角形拼成的一个较大的等边三角形.已知
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/23/92118c0b-03aa-4e0b-a6c6-e6843f728bc8.png?resizew=131)
(1)证明:F为AD的中点;
(2)求向量
与
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/398c706527f19fa7030e482d97ce25b5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/23/92118c0b-03aa-4e0b-a6c6-e6843f728bc8.png?resizew=131)
(1)证明:F为AD的中点;
(2)求向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af5f1b06a56fc382feed28e01f1ad102.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f33a112e9728d7b560199765c815f69.png)
您最近一年使用:0次
2023-04-20更新
|
561次组卷
|
7卷引用:江西省部分学校2022-2023学年高一下学期4月期中联考数学试题
6 . 如图,在
中,D为AC的中点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/1c649a84-9ec6-48eb-b41d-1566a31f95e3.png?resizew=177)
(1)证明:
;
(2)若
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854f480c60b88b546cb15d3b5622e212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee020302d83e5a5d5aebf7c359577072.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/1c649a84-9ec6-48eb-b41d-1566a31f95e3.png?resizew=177)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbaa481d2d0f31e7c730e1d5385dd1bc.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d78bfbef90104db1f5e0e4c8c89f08c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78cc5c3753ce2106c0902155349a0935.png)
您最近一年使用:0次
2022-10-12更新
|
441次组卷
|
2卷引用:江西省赣州市赣县第三中学2022-2023学年高二上学期期中测试数学试题
7 . 如图所示,在
中,点D是边BC的中点,点E是线段AD的中点.过点E的直线与边AB,AC分别交于点P,Q.设
,
,其中![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ee44c8ad5792736787bb903ca273db.png)
![](https://img.xkw.com/dksih/QBM/2022/10/10/3084552225349632/3085931629084672/STEM/99cbf902e79b456d83a8b162745b5770.png?resizew=199)
(1)试用
与
表示
、
;
(2)求证:
为定值,并求此定值;
(3)设
的面积为
,
的面积为
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93179982551da01266d5f1bc177fb4ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe91df8a5a97bf49ab8004f07f64e908.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ee44c8ad5792736787bb903ca273db.png)
![](https://img.xkw.com/dksih/QBM/2022/10/10/3084552225349632/3085931629084672/STEM/99cbf902e79b456d83a8b162745b5770.png?resizew=199)
(1)试用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/228f4ddbb8959f904d71259be7c6ab36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1da92a2fc2ce861e82f7192fe4e648f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1fe2d802f2b37e7db198c5a3c1df9a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b680f91c4a693cc9ab2c23f2e9114ce.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febf7413b35cf2889fdb57a6b519087c.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac8a4086cd8af00e89c57fdfd905114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd72016a9855cbf0056ff732fe872612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235f0a6fb218d28383e6f27f2df1f50f.png)
您最近一年使用:0次
2022-10-12更新
|
444次组卷
|
3卷引用:江西省赣州市名校2023届高三上学期期中联合测评数学(文)试题
名校
8 . 在
中,内角A,B,C所对的边分别为a,b,c,
,
的平分线与边
交于点D,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/23c7817c-b581-4f85-9935-d95c46f626d2.png?resizew=219)
(1)求证:
.
(2)若
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35894a0973aac742a253bb725fda33b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/23c7817c-b581-4f85-9935-d95c46f626d2.png?resizew=219)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f97b6fb066810fadd9e54e2cd60697f1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7fa79a550591eb9e1bd07bced3a08fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
2021-11-27更新
|
372次组卷
|
4卷引用:江西师范大学附属中学2019-2020学年高一下学期期中数学试题
江西师范大学附属中学2019-2020学年高一下学期期中数学试题甘肃省天水市麦积区2022-2023学年高一下学期期中数学试题(已下线)11.2正弦定理(第2课时)-【上好课】2021-2022学年高一数学同步备课系列(苏教版2019必修第二册)(已下线)高一数学下学期期中精选50题(基础版)-2021-2022学年高一数学考试满分全攻略(人教A版2019必修第二册)(原卷版)
20-21高一·浙江·期末
名校
9 . 如图,在矩形
中,
,E为
的中点,把△
和△
分别沿
折起,使点B与点C重合于点P.
平面
;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cd4fb83908d0cabf3cc17ea6ce4a3c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e88d8672e8521e27058252f51000281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db807b09cc550f476b3f8fa0c6a14425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a571a8a9e4b838f8e9297bbba7f9d121.png)
您最近一年使用:0次
2021-03-18更新
|
1744次组卷
|
3卷引用:江西省南昌市八一中学、洪都中学等七校2020-2021学年高二下学期期中联考数学(理)试题
江西省南昌市八一中学、洪都中学等七校2020-2021学年高二下学期期中联考数学(理)试题(已下线)【新东方】绍兴高中数学00032安徽省马鞍山市第二中学2023-2024学年高二上学期开学检测数学试题
解题方法
10 . 在
中,角
的对边分别是
,且
,
,
(1)求证:
;
(2)若
的面积
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa9f29383885f085b64b7091e1cd5884.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2157a5925c9590bbce5e3fc093f7767.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46a70d32c64918aa4d1d9d3ce0bdbf7b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/308a31443e11f83d3f06f1dd91a73204.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
您最近一年使用:0次
2020-11-22更新
|
213次组卷
|
2卷引用:江西省赣州市南康区第三中学2021届高三数学(理)期中考试模拟试题