1 . 已知以
为直径的半圆有一个内接正方形
,其边长为1(如图).设
,作数列![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9568fb229373710ad4724cc3f477dfca.png)
;求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294726f8e596ce099d050ebcd538e421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9568fb229373710ad4724cc3f477dfca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d5372953a9418602a7ed89b5421a47c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7e1f83f40a593ee29894f670f4bf24e.png)
![](https://img.xkw.com/dksih/QBM/2022/11/9/3105787452817408/3105824076627968/STEM/eb347e351cf84c4f8722c9a8545340b1.png?resizew=222)
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2 . 设1980年底我国人口以10亿计算.
(1)如果我国人口每年比上年平均递增
,那么到2000年底将达到多少?
(2)要使2000年底我国人口不超过12亿,那么每年比上年平均递增率最高是多少?
(1)如果我国人口每年比上年平均递增
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f762a1de162d8dca6dcd06a3107c3fe5.png)
(2)要使2000年底我国人口不超过12亿,那么每年比上年平均递增率最高是多少?
下列对数值可供选用:![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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2卷引用:1981 年普通高等学校招生考试数学(文)试题(全国卷)
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3 . 已知三棱锥A-BCD的体积是V,棱BC的长是a,面ABC和面DBC的面积分别是
和
.设面ABC和面DBC所成的二面角是α,那么![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00b80751c98f9991b9cfc03923a98834.png)
______ .
![](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/00b80751c98f9991b9cfc03923a98834.png)
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4 . 设
是一个已知圆的内接矩形,过
作该圆的切线与
的延长线相交于点
,与
的延长线相交于点
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af045d2542c40f955a9de356b9b088c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4ba59cd775599cd3651d1e6c6b64599.png)
![](https://img.xkw.com/dksih/QBM/2022/11/9/3105786591264768/3105817716645888/STEM/a01599bddc70465b86f1fb3dbff5e409.png?resizew=214)
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2卷引用:1979 年普通高等学校招生考试数学(文)试题(全国卷)
真题
5 . 甲,乙二容器内都盛有酒精,甲有
公斤,乙有
公斤.甲中纯酒精与水(重量)之比为
,乙中纯酒精与水之比为
.问将二者混合后所得液体中纯酒精与水之比是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4764374bd2fb78e59cd0b283637baeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63055a5d6916f99d07fede49120753f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a19c2059659d8d9efd98258212efaffc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90789e0f0d5dd0b5574dbea25b40af3.png)
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2卷引用:1979 年普通高等学校招生考试数学(文)试题(全国卷)
真题
6 . 已知曲线
.在它对应于
的弧段上求一点P,使得曲线在该点的切线在y轴上的截距为最小,并求出这个最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8086290e5be256dac5e5a6eba934d8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fbb01a7f5e9861aa185c6c63fcd58c0.png)
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7 . 设O为复平面的原点,和
为复平面内的两动点,并且满足:
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bb8477bcc87b1401970171bf57b9ecb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2c1fd680a5d355178273c6d6025eb80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a9adf887460fec0d68f2edde16a6f1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a768c27286250cc7ec3bdac6ef301def.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5927f1967a8f72e8fb887edb5023a921.png)
求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5927f1967a8f72e8fb887edb5023a921.png)
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8 . 如图,设平面
和
相交于
,它们所成的一个二面角为
,
为平面
内的一点,
为面
内的一点,已知直线
是直线
在平面
内的射影,并且
在
上.又设
与平面
所成的角为
,
,线段
的长为
,求线段
的长.
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](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/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2dca049735b45fb9b2533c68605eddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf830155a3da312ecbf6aeced9e85ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://img.xkw.com/dksih/QBM/2022/11/9/3105791087468544/3105817650937856/STEM/a8ef388c634544459b54347308833bf9.png?resizew=216)
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9 . 如图为一台冷轧机的示意图.冷轧机由若干对轧辊组成,带钢从一端输入,经过各对轧辊逐步减薄后输出.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/a8652359-f7f3-47a3-8ac2-6769038339a3.png?resizew=383)
(1)输入带钢的厚度为
,输出带钢的厚度为
,若每对轧辊的减薄率不超过
.问冷轧机至少需要安装多少对轧辊?(一对轧辊减薄率
)
(2)已知一台冷轧机共有4对减薄率为20%的轧辊,所有轧辊周长均为1600若第k对轧辊有缺陷,每滚动一周在带钢上压出一个疵点,在冷轧机输出的带钢上,疵点的间距为
.为了便于检修,请计算
并填入下表(轧钢过程中,带钢宽度不变,且不考虑损耗).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/a8652359-f7f3-47a3-8ac2-6769038339a3.png?resizew=383)
(1)输入带钢的厚度为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2833ddbe58a6f4e7585c69c698f0d2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56e0517a985efe32d0f3a7ea23f564bf.png)
(2)已知一台冷轧机共有4对减薄率为20%的轧辊,所有轧辊周长均为1600若第k对轧辊有缺陷,每滚动一周在带钢上压出一个疵点,在冷轧机输出的带钢上,疵点的间距为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d327216c2b7d31491dcbd22c71dae42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f6bceba89ed9a23743dec7542e8a0bb.png)
轧辊序号 | 1 | 2 | 3 | 4 |
疵点间距![]() | 1600 |
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2卷引用:1999年普通高等学校招生考试数学(文)试题(全国卷)
10 . 复平面上点A,B对应的复数分别为
,点P对应的复数为z,
的辐角主值为
.当点P在以原点为圆心,1为半径的上半圆周(不包括两个端点)上运动时,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c851465a30dd28567031e4773cd5deb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34f255a307b7c87bffdfb67295f52bbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6581916f5a65edfea257c804efee007e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6581916f5a65edfea257c804efee007e.png)
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