已知实数a,b,c满足:
.
(1)
;
;
.
(2)求
的平方根.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c04a6a406e17723c2bfeb9e15e31178a.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e9bb42376c12d7d21702ae8062b25a.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c01117852ab7b9ce6551ec49aa14420.png)
22-23八年级上·山东济南·期中 查看更多[5]
山东省济南市济南高新技术产业开发区2022-2023学年八年级上学期期中数学试题(已下线)实数02练基础(已下线)考点1开方(已下线)【单元测试】第六章 实数(B卷·能力提升练)-【单元测试】2022-2023学年七年级数学下册分层训练AB卷(人教版)吉林省长春市榆树市八号镇第二中学2022-2023学年九年级上学期11月月考数学试题
更新时间:2022-11-04 17:22:47
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【推荐2】如图,在平面直角坐标系中,点
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4772c835cbe626040ecc4df30e6f0ccc.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03af5b7b70517948dcbdd64884979022.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e3821b7c6b611d5c547a5a1c4e1feca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4a0d3177db48f26d347867b8fde3353.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1d471cc4a0235df0b32fdcedd08b028.png)
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【推荐1】(1)当
,
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①
②
.
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①
②
.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcdb7a488910743dc5c63afb394b87e2.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09ffc1644c7029219b88232145abbdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fcef7b3fa62f7ef7b2bd7d5dd1ef07a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb8e1dd8da540badcb9a8f427c5b202e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23725094c363fd158166a8698971694c.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09ffc1644c7029219b88232145abbdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fcef7b3fa62f7ef7b2bd7d5dd1ef07a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09ffc1644c7029219b88232145abbdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fcef7b3fa62f7ef7b2bd7d5dd1ef07a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b05ee9e804d0da4f5d095eb59575428.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c64801c6e70989ab3cf2597855b28f48.png)
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【推荐2】甲、乙两个批发店销售同一种苹果,甲批发店的价格为每千克6 元,在乙批发店,当一次购买数量不超过
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59f0e84413d0eb3bc124f95b7b371ce3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59f0e84413d0eb3bc124f95b7b371ce3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59f0e84413d0eb3bc124f95b7b371ce3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59f0e84413d0eb3bc124f95b7b371ce3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5ca1e25f9a01f7689184f7c9e0f2c82.png)
(1)下表中,
![](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/071a7e733d466949ac935b4b8ee8d183.png)
一次购买苹果的数量(单位:kg) | 20 | 50 | 100 | … |
甲批发店花费(单位:元) | 120 | ![]() | 600 | … |
乙批发店花费(单位:元) | ![]() | 350 | ![]() | … |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
①甲批发店所花费的钱数为 ;
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59f0e84413d0eb3bc124f95b7b371ce3.png)
③当一次购买数量超过
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f04cc1e3cfe579d9dc29a21c7c5c416.png)
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