1 . 已知
是方程
的一个根,求![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c564c9ab6d2cef1b8906b2c1a56349c3.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54b53b86bd516400d6fa7dabb3603f31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828765097c682c0b260c81e5bf6229a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c564c9ab6d2cef1b8906b2c1a56349c3.png)
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2 . 若方程
(
为常数)的一个解是
,则另一个解![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15dad5a12f34bed0da0de93beae0eaa4.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c2fb0907b326787f3fc0151aa95d363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87a60302649eb940748da818199e55da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15dad5a12f34bed0da0de93beae0eaa4.png)
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2024八年级下·浙江·专题练习
3 . 若一元二次方程
的两根也是方程
的根,则
的值为____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9ed38a31a738a14d695981245182ba8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3523121aefc0c6ed679d5e2f7656ecde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0af32c19b54bc8c2ae67d39fc5851890.png)
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4 . 若方程
有一个解为
,则方程
的解为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/390eabc740e5882877d11bfdfb9f883e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5ef0053eed9b535fdc49b314b3eeb4.png)
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5 . 已知点
为线段
上一点.如果
的比值为关于
的方程
的解,那么点
为
的
阶黄金分割点.
已知
阶黄金分割点作法如下:
步骤一:如图,过点
作
的垂线
,在垂线
上取
,连接
;
步骤二:以点
为圆心,
为半径作弧交
于点
;
步骤三:以点
为圆心,
为半径作弧交
于点
;
结论:点
为线段
的
阶黄金分割点.
时,点
为线段
的______ 阶黄金分割点;
(2)作法步骤一中,当![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
______ (结果用
的代数式表示)时,点
为线段
的
阶黄金分割点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf83e20035c3afd6d26ebfd53d768a70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5b053db0e2d73b30224628c43c0af24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/248a9c901d039cd5bbc4c4cdacca63eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf83e20035c3afd6d26ebfd53d768a70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
步骤一:如图,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/446020d9d837f8698676b56b773f805a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
步骤二:以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
步骤三:以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf83e20035c3afd6d26ebfd53d768a70.png)
结论:点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf83e20035c3afd6d26ebfd53d768a70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3a2a34b4317deffa40ba34e269c2b81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf83e20035c3afd6d26ebfd53d768a70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)作法步骤一中,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf83e20035c3afd6d26ebfd53d768a70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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6 . 设
是方程
的两个实数根,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fc1b83eee609b16000c734316e199e0.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4cdd6f27334444c1884876b9e4cfe6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fc1b83eee609b16000c734316e199e0.png)
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7 . 若a为方程
的一个根,则代数式
的值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b21278fc1806439cb3343668cde9d3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826aa78e9c7bb68a5af1c92f3c6bf1a2.png)
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8 . 若
是方程
的一个根,则代数式
的值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4cdd6f27334444c1884876b9e4cfe6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58a2b257827ba6de3c6df3d4c8fc4e39.png)
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名校
9 . 已知a为方程
的一个根,则代数式
的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f537c02355c9bc4f1abb2490be8bac1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20dcc15d62f54668e221769d593fc189.png)
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名校
10 . 已知关于
的一元二次方程
有实数根,设此方程的一个实数根为
,令
,则
的取值范围为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1ff64333e457423a47cbd59893bcbdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d79410a3bff6bf9eb5ffe62c2de0309f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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