1 . 若
,
是一元二次方程
(
,a,b,c为常数)的两个根,则
,
.这个定理叫做韦达定理.
如:
,
是方程
的两个根,则
、![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a40e391ab9d1a7d09d1d9fdb0266008b.png)
已知:M、N是方程
的两根,记
;
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e48c8e0add458a80e55e272af8c6d5f6.png)
(1)
__________,
__________;(直接写出答案)
(2)当
且为整数时,猜想
,
,
之间有何关系?并证明.并利用结论求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13fa32c1e926f40a0722d106563777ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f05dd02b6f561dcf94bab8a3160108d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2821505cff9f2179795ebe2fbf01a0b.png)
如:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14baa050fb08d1e22bc1f9b1309836b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b70fc850e0eec4580731c4d8c74849a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a40e391ab9d1a7d09d1d9fdb0266008b.png)
已知:M、N是方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4cdd6f27334444c1884876b9e4cfe6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88a75d17cc752e7aad1212fecaf88f49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c68f2eb78b2d779e37c2b6e1071fafd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07096af3b99fd1cb11c31f19a2c6408e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e48c8e0add458a80e55e272af8c6d5f6.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3dabace330ccdd9755fbcf32d5d6343.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1b625192d7398634a02ea24fa78ed87.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bcfc48f9bc23cc43085bdb910e7a136.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55e06de381c46e58d40aaced29d9297e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/706ac8040e8a3110a27e671662696531.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f82cf33bd56baebda867a6d663b35775.png)
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2 . 已知
,下列结论正确的个数为( )
①若
是完全平方式,则
;
②
的最小值是2;
③若n是
的一个根,则
;
④若
,则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81d44643aae979c94ec9fef8e7a36083.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a69a82bb9d8edbab6d6e2f6297b76e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4faad63ae484f7eb68f46f74c2ccb92e.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06430886275f5ad62bcda62fce691e99.png)
③若n是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662141a46198d8cfec22710d1933856f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc299fa203b9b74082afd163b2a11074.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218a1bdf86da26e9dad720145a4470d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/285af8f001ae42da68c8683606e9cd95.png)
A.1个 | B.2个 | C.3个 | D.4个 |
您最近一年使用:0次
名校
3 . 有下列命题,其中正确命题的序号____________________
①若
,则关于x的一元二次方程
有一个实数根为
.
②函数
通过配方可化为
;
③已知
,
是抛物线
上的相异两点,则当
则
.
④求代数式
的最值,可通过“换元法”求解:设
,则代数式可化为
,利用二次函数的性质可求得最大值为
.
⑤点
,
都在二次函数
的图象上,若
,则m的取值范围为:
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c766352f0be38b719621052de92615bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad8ab5f9fade787d8219b65608aaa892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
②函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c636fd0bf60db3462abfab2ee250382b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f61dacaafcbc000a87510b5ecf2e3a1.png)
③已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c663466d641b5fdfef1e529d6c330ecf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/166afeb61d5a80366a8ae29c912cd644.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65b902385c866d36407cc6baa924f29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f2d9a35de63dcab1e45dcae3a69eb37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d49b717d258a16709cdd23432c091624.png)
④求代数式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d3f100ee18aee56770381cb804cd7bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd0d231fb43d79bf5af70191a718291.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/688af108d3ce24dcd0d83868211660b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
⑤点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e8aeafb2c8b636c447606cfc8b39a35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d0b3952afbd3cb2de13e0399d75378.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a4e8779b8f81fbdb159edd04533b401.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac67e9a909472ab852d38d2ec66a1e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77cbe299f73c164c2c9f3ec529ee5f3e.png)
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4 . 已知实数m,n满足
,
,且
,若
,则代数式
的最小值是____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/462858cb6d3dc7e38ca68075344557a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50a288702f710795e2423c69f6aac41e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7d9712c3b25f3030e166e136d3a4686.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8a671406a5442a3088a4ee1d064114a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed0ba6a5fe6d0f53dddc6a8ef25c4f69.png)
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2023-11-27更新
|
255次组卷
|
3卷引用:江苏省南通市崇川区2023-2024学年九年级上学期期中数学试题
5 . 已知关于
的方程
.
(1)求证:无论
取何值,方程总有实数根;
(2)若方程的根为整数,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c34b26f971ea63b069e2f135c44aa6c9.png)
(1)求证:无论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若方程的根为整数,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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2023-10-07更新
|
457次组卷
|
2卷引用:河北省石家庄市赵县2023-2024学年九年级上学期月考数学试题
名校
6 . 【问题提出】
(1)如图1,在
和
,已知
三点在一条直线上,
,求
的长度.
(2)如图2,
与
均为等边三角形,若点
为边
上的一点,以
为一边作
,另一边交
于点
,连接
,试探究线段
的数量关系,并说明理由;
【解决问题】
(3)如图3,在三角形
中,
,若
,求
的面积.
(1)如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2598f844644c4245eb226ecca57ee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67eb559c6e5cd16f2036986157c6a911.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3d83336b17556c619a621e973cc36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddcf824fcf7aa9211980142acc3cb226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5def0d34ee55d87e197413eb07677c4f.png)
【解决问题】
(3)如图3,在三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99d97c9836bccebc5070ae87f3a9f77b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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7 . 已知
中,
,
.
(1)在边
上求作一点D,使得
;
(2)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03dec5f11c1dcf9747edcd27a798fa56.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/23/ef78dc98-7141-4d69-8c6d-a1ed1bbdc7ca.jpg?resizew=107)
(1)在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ff29971ccc633d89832ffa9bd54afa3.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a8f1e90875c57796fde78cdc8bf9cd6.png)
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8 . 已知关于x的方程
.
求证:不论
为何实数时,方程
有固定的自然数解,并求这自然数;
设方程另外的两个根为
、
,求
、
的关系式;
若方程
的三个根均为自然数,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11fdad670cc0eec460323a0b9ad638fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11fdad670cc0eec460323a0b9ad638fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad481cbfb67ac9cdbc0537f3de23b022.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc13a607ac0c7f76d252d7cb1bb040fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad481cbfb67ac9cdbc0537f3de23b022.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc13a607ac0c7f76d252d7cb1bb040fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f82e415812cca9545611c0faa0c01b1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11fdad670cc0eec460323a0b9ad638fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
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9 . 阅读材料.材料:若一元二次方程
的两个根为
,
,则
,
.
(1)材料理解:一元二次方程
的两个根为
,
,则
,
.
(2)类比探究:已知实数
,
满足
,
,且
,求
的值.
(3)思维拓展:已知实数
,
分别满足
,
,且
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/807d62d0b5623b3bd3cb285560bf8436.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f05dd02b6f561dcf94bab8a3160108d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/897630dd340ec6c6b20cdd754d0a12c9.png)
(1)材料理解:一元二次方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52ee9a4b35a09cc4bf56382c99433b47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97dad16e4910ec15add074c4077b0e86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f947d030c265753e4201ae4d9c69e99.png)
(2)类比探究:已知实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdf6795a22bb877eebbdcec3c938938f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b5ede0c2043b195abb108dfc7fd886f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7d9712c3b25f3030e166e136d3a4686.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f871af1499aa05c6dd8951277133e96f.png)
(3)思维拓展:已知实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee1bac654d259b0459ecbfc594c5c56a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58bdf823d4cb54ed257bd5cd16fbc713.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87b426a8088ffda5e3e64927a8404745.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d6f17123d51ab1619430ee30810333f.png)
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10 . 若方程
的两个不相等的实数根
满足
,则实数p的所有值之和为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9295b9b8d1f4e357030ec10a7356b6e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bff60eab72de85437e12806474281612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b73315f310a0a77e913a05b14f4b608.png)
A.0 | B.![]() | C.![]() | D.![]() |
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2023-03-13更新
|
618次组卷
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7卷引用:安徽省安庆市桐城市五校联考2022-2023学年九年级下学期月考数学试卷
安徽省安庆市桐城市五校联考2022-2023学年九年级下学期月考数学试卷(已下线)期中押题重难点检测卷(拔尖卷)(考试范围:第1-3章)-【帮课堂】2022-2023学年八年级数学下册同步精品讲义(浙教版)(已下线)期中押题重难点检测卷(提高卷)(考试范围:第1-3章)-【帮课堂】2022-2023学年八年级数学下册同步精品讲义(浙教版)(已下线)期末难点特训(五)和二次方程有关的期末难题-【微专题】2022-2023学年八年级数学下册常考点微专题提分精练(浙教版)(已下线)2023年安徽省亳州市中考二模数学试题变式题6-10题(已下线)第12讲 一元二次方程的根与系数的关系(六大题型)-【暑假自学课】2023年新九年级数学暑假精品课(北师大版)(已下线)清单03 根与系数的关系十二大经典题型 (12种题型解读(42题))-2023-2024学年九年级数学上学期期末考点大串讲(苏科版)