名校
1 . 定义区间
的长度均为
,其中
.
(1)不等式组
的解集中各区间的长度和等于8,求实数
的取值范围;
(2)已知常数
,满足
,求满足不等式
的解集中各区间长度之和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dea81d99b5fe5d506bbd3e4843d085a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba426b113b9e781b0e45a17872dc0815.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40aac3b8bed3f6e9b79a1f7c0ff6c830.png)
(1)不等式组
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93b5e05c2f0eebfebc3568d69dac9746.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08075b3b73dd2609baad69a496fdd9a8.png)
(2)已知常数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cae22c3fbdb2ad97d9fa6b542490a28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bed0d3e6741e0193addff8cf7b25019c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e383476c275769e102fd17e6af59b321.png)
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解题方法
2 . 设全集
.
(1)解关于
的不等式
;
(2)记
为(1)中不等式的解集,
为不等式组
的整数解集,若
恰有三个元素,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a64dc61989ca50b9ee19d835c4ed268.png)
(1)解关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de90ac59bcff9f91525b40d2018f0c6f.png)
(2)记
![](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/7fbc1d281c186b0ac29ea9c92a1b24c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00c5e00c0716742d29b5814b83e07528.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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解题方法
3 . (1)解不等式:
;
(2)设集合P表示不等式
对任意x∈R恒成立的a的集合,求集合P;
(3)设关于x的不等式
的解集为A,试探究是否存在a∈N,使得不等式.
与|
的解都属于A,若不存在,说明理由.若存在,请求出满足条件的a的所有值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4792db06e3e32dccdbec06922ee62d3b.png)
(2)设集合P表示不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/318b4bc3fd817a8a1731c2168273d876.png)
(3)设关于x的不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa93ab2b74e928c5a7f4facabd6e233e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/700fa4dfbe1d291042d435778db55f5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25b4350e789f1c3ca3c3e67908960b20.png)
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2020-12-07更新
|
267次组卷
|
4卷引用:上海市松江二中2020-2021学年高一上学期期中数学试题
上海市松江二中2020-2021学年高一上学期期中数学试题上海市川沙中学2020-2021学年高一上学期期末数学试题(已下线)第二章 等式与不等式(压轴必刷30题7种题型专项训练)-【满分全攻略】(沪教版2020必修第一册)(已下线)2.3 三角不等式(第3课时)(2)
4 . 定义区间
、
,
、
的长度均为
,其中
.若不等式组
的解集中各区间长度和等于8,则实数t的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba7204f43679af6935e494c59d40c6ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57b85a97933a1d984f6e484b4021c800.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bd4d438ae7d4da0e100bb92d622c866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31a381cebfeee07ae150cdeff6e7a64d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64da75a02173c2a5eb40f4c68d0f4f36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eae51f0310b87cde2e206643e9d25a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3f03d4f1c1607a15b59cc39eb866548.png)
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5 . (1)在复数范围内解方程:
(i为虚数单位);
(2)设系数为整数的一元二次方程
的两根恰为(l)中方程的解,求
的最小值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f31bce2a133fdf2231046fa43cb4f149.png)
(2)设系数为整数的一元二次方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13fa32c1e926f40a0722d106563777ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a343d47de28db5748a6f0a8c6f4715d7.png)
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16-17高二下·上海浦东新·期末
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6 . 解不等式
(1)解关于实数
的不等式:
,其中
是实参数;
(2)解关于正整数
的不等式:
,其中
是给定的正整数.
(1)解关于实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c0aeb5c5bad894c0af0234e518c9b4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)解关于正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/089c0f08cca949e46afc4e760fadbd07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6f2937d5df093c9002881fc264ea351.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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7 . 解下列关于
的不等式(组)
(1)解不等式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad9944a94b80bd9c0ef3d83f20093561.png)
(2)解不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(1)解不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad9944a94b80bd9c0ef3d83f20093561.png)
(2)解不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0687f17b54dfa59599619f056e175941.png)
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18-19高二下·上海浦东新·期末
名校
解题方法
8 . 将一枚六个面的编号为1,2,3,4,5,6的质地均匀的正方体骰子先后掷两次,记第一次出的点数为
,第二次出的点数为
,且已知关于
、
的方程组
.
(1)求此方程组有解的概率;
(2)若记此方程组的解为
,求
且
的概率.
![](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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d4af77ba6b65c69d1b8116ad83176ce.png)
(1)求此方程组有解的概率;
(2)若记此方程组的解为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/791e5077761961e5014d353f5bdc07f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee21db6628e4db3f5831370549fa96b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b170470d02c85c1be9a3faff5eca0de.png)
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9 . (1)设向量
,
,向量
垂直于向量
,向量
平行于
,试求
时,
的坐标;
(2)用行列式解方程组
(
为常数)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9d72c37a4a3a308e1f019a7b5074785.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/215e52cd8cf624e9dd412978fe4e81a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4407c0b2e5febf70f610bd00067f105.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/329fdf7d989f77a32ca9e0361a9cc956.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1da92a2fc2ce861e82f7192fe4e648f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dfde0038de382d2be9701cea23ef7eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1876f10610ac6e4f0529a6877e51415f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c10c8b60c45bdd5a49b5c130e755d9e8.png)
(2)用行列式解方程组
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f26edc0fc55b1b933c016b5bb6c49d53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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10 . 已知关于
的一元二次方程组
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ec9d65f2ecb3cd3e3c9dbefb3472a65.png)
(1)若方程组至少有一解,求
的取值范围;
(2)讨论方程组的解的情况并求解方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2e647c14561826ba9e396acc5a3792c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48d4f45fa516d26702bd57ff2209a9cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ec9d65f2ecb3cd3e3c9dbefb3472a65.png)
(1)若方程组至少有一解,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)讨论方程组的解的情况并求解方程.
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