1 . (1)对实系数的一元二次方程可以用求根公式求复数范围内的解,在复数范围解方程
;
(2)对一般的实系数一元三次方程
(
),由于总可以通过代换
消去其二次项,就可以变为方程
.在一些数学工具书中,我们可以找到方程
的求根公式,这一公式被称为卡尔丹公式,它是以16世纪意大利数学家卡尔丹(J. Cardan)的名字命名的.卡尔丹公式的获得过程如下:三次方程
可以变形为
,把未知数
写成两数之和
,再把等式
的右边展开,就得到
,即
.将上式与
相对照,得到
,把此方程组中的第一个方程两边同时作三次方,
,并把
与
看成未知数,解得
于是,方程
一个根可以写成
.
阅读以上材料,求解方程
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed344791b8b035ca04d4b5af7364cae5.png)
(2)对一般的实系数一元三次方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ad9d68d15b5d5121fcf99ebddaa986.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae0f3c81f415857813838d4b9b714d56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ea05ab19c339e26f8268fbc7b6e918d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5dd275a6062b21f9c3e9155c7e0ba62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5dd275a6062b21f9c3e9155c7e0ba62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ead1b77b69e6b51d6d483331fd01d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0bed1a02239821a616bc173181e7ed2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c26aacdd3362aa65b2966045cbfcddf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f02c3aa1326c9b1e069b6997cd29bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11792ad247341c0dbc80663dd0fa6f77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ead1b77b69e6b51d6d483331fd01d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1e8aa11c220ffef18a553784e1ecc16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/491db400b0e81be11e3fd8729fe61a41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36accab23dbd172687769aea43e5781c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411a315870ed3e6d0e8ea885f1a04bcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a9930c09269f4f03794e38c17f6da67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5dd275a6062b21f9c3e9155c7e0ba62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49d63387694fd1caafce80adfb43c86b.png)
阅读以上材料,求解方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93c3d494147195cf4f5e1fa3f6f5a0b9.png)
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解题方法
2 . 已知集合
.
(1)当
时,关于
的不等式组
没有实数解,求实数
的取值范围;
(2)若
,且关于
的不等式
的解集为
,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d57c293ebc3b99cb7aff9b3e585dcdc7.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2bc9551406faf1c4f1e444dbd66237b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2454a6dc18fdf2cde16cb1b096ea8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/811625bead5bd88970550be98125aa3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5258a748e0915550223745b9d4aa68f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a837165ca03f9e4ea8964979c95e3bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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解题方法
3 . 已知
.
(1)化简
;
(2)若
,求
的值;
(3)解关于
的不等式:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63b4dd76f6c861e6679cb9073cfd6546.png)
(1)化简
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5224a7da7fe6bc28971ce4c277f88588.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e80cb671b487924bc2653e344845366.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bdfc7179ee7be632aede7fad755736d.png)
(3)解关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fa64358d46ac0ce47e3bc71fe028a2e.png)
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4 . 已知函数
.
(1)当
时;解不等式
;
(2)若
,解关于x的不等式
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041fe70ee715b5e0124749a4ab5e3deb.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4f5e34a75ab0baeffa3ccbf93c00591.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24505cd5c1d84ecb57404c645ea44c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e38c541dec8fce1d26886e5ef7d21f.png)
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5 . 甲、乙两位同学在求方程组
的解集时,甲解得正确答案为
,乙因抄错了c的值,解得答案为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5225982e0f2e1f8b47df08480d501654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9ce0be6ed4a3f0eee99bb6f20911e53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85b47d69260bb8ba59d6da90d068dde0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b1568303e147cf1e1c133c189be4afb.png)
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6 . 已知
,函数
.
(1)当
时,解不等式
;
(2)若
,不等式
恒成立,求
的取值范围;
(3)若关于
的方程
的解集中恰好有一个元素,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da989240786ef7c3e2d903f30caf59e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ab5c53352f3eafd25b5dbf4ee5bbbd6.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/030805eebb5ad0a065f93bd6f652f687.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eda48853e8bdb7e266370b4e0d5a258.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319dd83988b2df186b46781f02c6ae2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)若关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9862721dbbff0b6389f99cbb4eca4ab8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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7 . 若关于
一次方程组
的解满足
,则m的取值范围______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a32c731550df64b7e59b0bb33effd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6fa0bb61ce60310f18cb95bf2e83c8a.png)
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10-11高二上·山西·阶段练习
8 . 已知
,
(1)当
时,解不等式
;
(2)若
,解关于
的不等式
.
![](https://img.xkw.com/dksih/QBM/2013/6/8/1571241186672640/1571241192349696/STEM/4a70098340054084b840b8e24dfaf41c.png)
(1)当
![](https://img.xkw.com/dksih/QBM/2013/6/8/1571241186672640/1571241192349696/STEM/70ad5c71f46648a9a9618ca8cfab6438.png)
![](https://img.xkw.com/dksih/QBM/2013/6/8/1571241186672640/1571241192349696/STEM/a1a0283c5e804e77be9b65525442c4dd.png)
(2)若
![](https://img.xkw.com/dksih/QBM/2013/6/8/1571241186672640/1571241192349696/STEM/5a227ba98a3c4b10b09f4af4d0fc9610.png)
![](https://img.xkw.com/dksih/QBM/2013/6/8/1571241186672640/1571241192349696/STEM/f41ae8167db244c396f8914b62c5108c.png)
![](https://img.xkw.com/dksih/QBM/2013/6/8/1571241186672640/1571241192349696/STEM/a1a0283c5e804e77be9b65525442c4dd.png)
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解题方法
9 . 已知
函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42f1251944df1ff015562a10d667e8c8.png)
(1)当
时,解不等式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee707bd9a98d7e3fbcaf3a47595c7ebd.png)
(2)若关于
的方程
的解集中恰好有一个元素,求
的取值范围;
(3)设
若对任意
函数
在区间
上的最大值与最小值的差不超过1,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccf86c02fc2d3fcf7881e6fed3df9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42f1251944df1ff015562a10d667e8c8.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65397f11ea8af736f38debadf420c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee707bd9a98d7e3fbcaf3a47595c7ebd.png)
(2)若关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb84b8dccc15c156e42ec76cd00fe42f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/263adb79cbd72164cc1468a37cb67eb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ad519b3f5c90172d9ba4d7c7c7c2b93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eb0381514dc997c3802b84868805cbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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名校
10 . 已知函数
.
(1)当
时,解不等式
;
(2)若关于
的方程
在区间
上恰有一个实数解,求
的取值范围;
(3)设
,若存在
使得函数
在区间
上的最大值和最小值的差不超过1,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ab5c53352f3eafd25b5dbf4ee5bbbd6.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65397f11ea8af736f38debadf420c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/018857ec6e498113b3b12a730d9313da.png)
(2)若关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f198f304b60422fb5065dcc742ab48a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc6554ac3dff4a59833e407db887f6e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6555c4166361c548b6f4f692d9a66cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c93c82944db4a310a2047dd6d8966162.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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