名校
1 . 如图,在正方形ABCD的对角线AC上取一点E,使得
,连接BE.
(1)证明:
;
(2)延长BE至F,使
,连接CF,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c239a56587c675b532347546b48ea09a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/f902101f-244a-446d-a4d8-e0d24c1cce53.png?resizew=160)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba11242dcc61d3c7c3555b598b5fdc89.png)
(2)延长BE至F,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d197ea8c1c8bbdf5edade431388eb713.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3a2d014899fa3341b58348530f3d98.png)
您最近一年使用:0次
2 . 对任意正整数n,记集合
,
.
,
,若对任意
都有
,则记
.
(1)写出集合
和
;
(2)证明:对任意
,存在
,使得
;
(3)设集合
.求证:
中的元素个数是完全平方数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a39352d44787ecda055946f530893f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5359f5f086b89cc656cdd4f79a3b7baa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5df0913f90131b298c8f6f57437f69b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20c1352dca7dc3caf67c1cb937d52795.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d35755ad07f05e7bfe00176d6334389f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75a28908216e6879a09b372d957be1e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90df641ab645927ee577e79faf18dcdd.png)
(1)写出集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a71fc9c0068109dad1382354570665.png)
(2)证明:对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e840ba7606959ccea36793f3ef0775d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b576952835af1f3492f0f3e6d00093e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90df641ab645927ee577e79faf18dcdd.png)
(3)设集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/112d102cbe7ce2bebe0c76e87e89a00c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
2023-11-15更新
|
164次组卷
|
4卷引用:北京市第八十中学2023届高三上学期开学考试数学试题
3 . 数学课上,张老师给出这样一个问题:
已知,如图,正方形
中,点
是
边上一点,作射线
,过点
作
于点
,交
的延长线于点
,连接
.求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/04b5384f-9ba9-4f59-8e42-636ddf571a10.png?resizew=238)
(1)小明和小颖根据题中的条件发现:图1中存在和
相等的角,即_________;
(2)在证明结论时,小明和小颖有了不同的思路.
小颖:我受结论中“
”的启发,可在线段
上截取
,再证
….
小明:我受结论中“
”的启发,可构造一个以
为直角边的等腰直角三角形…
请从小明和小颖的思路中任选一种作出辅助线并给出证明;
(3)张老师对问题进行了拓展;如图2,点
,
分别是线段
,
的中点,若
,
,则
的长度为_________.
已知,如图,正方形
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9677deecea626aa6e4078f0b532ba68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/763b45108308575da2886e15b9aaa409.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/04b5384f-9ba9-4f59-8e42-636ddf571a10.png?resizew=238)
(1)小明和小颖根据题中的条件发现:图1中存在和
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79cd9d0d73549e2944578f3513631ce5.png)
(2)在证明结论时,小明和小颖有了不同的思路.
小颖:我受结论中“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f338392e6ff0731afc335ead43df842f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ceed535959a7a57461b0497200f5eb42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cebd249e256bf9745fb904035f408408.png)
小明:我受结论中“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd7626a5615d4646ecf6dbffd93693b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
请从小明和小颖的思路中任选一种作出辅助线并给出证明;
(3)张老师对问题进行了拓展;如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82773737609e65dea3c5c67099f1b10d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
您最近一年使用:0次
4 . 如图, 在三棱锥
中,已知
是正三角形,
平面
,
,
为
的中点,
在棱
上,且
.
![](https://img.xkw.com/dksih/QBM/2022/9/5/3060015452348416/3063671285252096/STEM/2cc7e3148cd74b618f4f9f093327b8b8.png?resizew=248)
(1)求三棱锥
的体积;
(2)求证:平面
平面
;
(3)若
为
中点, 是否存在
在棱
上,
,且
平面
? 若存在,求
的值并说明理由;若不存在,给出证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d150134e5018f74fc4e8a016ced5f11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/457eb716c608c6b4fb6e91c8fc2ed163.png)
![](https://img.xkw.com/dksih/QBM/2022/9/5/3060015452348416/3063671285252096/STEM/2cc7e3148cd74b618f4f9f093327b8b8.png?resizew=248)
(1)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17580410bf63dba4fe164265afaac4cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18da88f27cc36dbf1d01bcea7341bc37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
解题方法
5 . 证明以下结论:
(1)已知
,求证:
;
(2)若
均为实数且
.求证:
中至少有一个大于0.
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ada798eeba5bd19d497bfd0741afd00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbc2278547879e9246de7e749a774d7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9ebe6c33debb66a7cbc9ecddc6c89de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
您最近一年使用:0次
名校
解题方法
6 . 如图所示,四棱锥
的底面是边长为1的正方形,
,E为
上一点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/16/d5a2014a-22ca-4d3a-bcd3-26bf77127c50.png?resizew=154)
(1)求证:
平面
;
(2)在侧棱
上是否存在一点F,使得
平面
?若存在,指出F点的位置,并证明;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e896ec179a48561a0671416340ddfc10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afcbbbe350b38381d1999e2886d45f0e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/16/d5a2014a-22ca-4d3a-bcd3-26bf77127c50.png?resizew=154)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)在侧棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9d32e76582bf550593fdef53e081225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e2da608b66c9aee03e2503388ba4fd.png)
您最近一年使用:0次
2022-09-15更新
|
1841次组卷
|
5卷引用:黑龙江省哈尔滨市第九中学2022-2023学年高二上学期开学考试数学试题
7 . 如图①,在直角梯形
中,
,将
沿
折起,使平面
平面
,得到三棱锥
,如图②所示.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/94a02f2c-665e-47ef-8ccb-cb021fc27a20.png?resizew=319)
(1)若E为
的中点,试在线段
上找一点F,使
平面
,并加以证明;
(2)求证:平面
平面
;
(3)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc3073a6c92e8fdba5b11963538b452.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06123e81c41198c76a3335757fac2c93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/94a02f2c-665e-47ef-8ccb-cb021fc27a20.png?resizew=319)
(1)若E为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7a407b262c22419f73396170ecdc849.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c309e58bf083bad13abd549720a63a22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
(3)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
您最近一年使用:0次
8 . 已知函数
恰有三个零点
.
(1)求实数
的取值范围;
(2)求证:①
;②
.(两者选择一个证明)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dfdab12b2d05b059cf8d15a0a40789b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcee20976de0e0e8c1ccd7a951674691.png)
(1)求实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)求证:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/836431f422ae196307dc7e08443ceb48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c62d118963f860b7b4b576f444a95a9.png)
您最近一年使用:0次
9 . 我们学习过利用用尺规作图平分一个任意角,而“利用尺规作图三等分一个任意角”曾是数学史上一大难题,之后被数学家证明是不可能完成的,人们根据实际需要,发明了一种简易操作工具——三分角器.图1是它的示意图,其中
与半圆
的直径
在同一直线上,且
的长度与半圆的半径相等;
与
重直于点
足够长.使用方法如图2所示,若要把
三等分,只需适当放置三分角器,使
经过
的顶点
,点
落在边
上,半圆
与另一边
恰好相切,切点为
,则
就把
三等分了.为了说明这一方法的正确性,需要对其进行证明.如下给出了不完整的“已知”和“求证”,请补充完整,并写出“证明”过程.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/62a403f1-c232-4d37-a853-0c1ecfc8e5d5.png?resizew=355)
已知:如图2,点
在同一直线上,
垂足为点
,
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/529c8336c1a523cccbdda7cf183cf219.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/435f30095577dc714634354f5ad27715.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/435f30095577dc714634354f5ad27715.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04122fc1074cff7e73beea9c2ec76ca2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/435f30095577dc714634354f5ad27715.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/62a403f1-c232-4d37-a853-0c1ecfc8e5d5.png?resizew=355)
已知:如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c7d41f6e9ebcd509b0c3446029d9ac2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833b91a24eb0fe0b2ee960193e83065d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
求证:
您最近一年使用:0次
解题方法
10 . 已知定义在
上的函数
满足:①当
时,
,②对任意
都有
,③![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ed670b1f668778c6243f3f7470ee7d2.png)
(1)求
的值.
(2)求证:对任意![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72d47e83d318ddac80bd8dc029ee2deb.png)
(3)证明:
在
上是增函数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/933093b52cca887f597cbe22a5467b11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d752d8db8a05b3ec7312f6ac8b64a07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c3c7d9a147725bd2ee363e3364b97b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9dbe6c97e2ffd3d4dcd75d138fd95f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ed670b1f668778c6243f3f7470ee7d2.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5d55ef0d1b7ea88d92fd6e1ecebb5f5.png)
(2)求证:对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72d47e83d318ddac80bd8dc029ee2deb.png)
(3)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/933093b52cca887f597cbe22a5467b11.png)
您最近一年使用:0次