阅读材料:像
,
,……这种两个含二次根式的代数式相乘,积不含二次根式,我们称这两个代数式互为有理化因式.在进行二次根式运算时,利用有理化因式可以化去分母中的根号.数学课上,老师出了一道题“已知
,求
的值.”
聪明的小明同学根据上述材料,做了这样的解答:
因为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20338421c3c7703e8466be944641409.png)
所以![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f85c5f898e62e6cbd49e0845cc399b7.png)
所以
,所以![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1c425519a742378cb5e63e94f15c8b2.png)
所以
,所以
,所以![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d560a6f187a70b561e34cb4958b960cc.png)
请你根据上述材料和小明的解答过程,解决如下问题:
(1)
的有理化因式是__________,
______;
的有理化因式是________,
______;
(2)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18ca4c5dfe044315d79a48b0854d7328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc8b53dc29f3e6fd05c2a7843aa00f57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab27ecd6a820dc891268e3aa55f3e98f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fd6cc81344ba6f442b2d682ab5f041c.png)
聪明的小明同学根据上述材料,做了这样的解答:
因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20338421c3c7703e8466be944641409.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f85c5f898e62e6cbd49e0845cc399b7.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abbac0015773638c86fe93d5b68fb9bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1c425519a742378cb5e63e94f15c8b2.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/583f333b48a747c4626a2dfc4650bf15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79f3deba702f6d0a88dbeed8d601dde6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d560a6f187a70b561e34cb4958b960cc.png)
请你根据上述材料和小明的解答过程,解决如下问题:
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53204688086b1d0111e91cb49fa0ac61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94e9a0492ac8187abaf264ba00499381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5246364ca8d76ddd707a001fe98cbb5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b696d79b394a09259c6b107b3e766eb.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f38f5b6273c89939ef2f2cb61967b40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea335d7b3608c8cd5977088a01c9e616.png)
22-23八年级上·山西运城·期末 查看更多[7]
山西省运城市盐湖区2022-2023学年八年级上学期期末数学试题浙江省台州市仙居县横溪镇新生中学2022-2023学年八年级下学期期中数学试题浙教版八年级下册第一章二次根式 单元测试数学试题广东省汕头市蓝田中学2022-2023学年八年级下学期期中考试数学试卷(已下线)专题2.25 二次根式的化简求值50题(分层练习)(提升练)-2023-2024学年八年级数学上册基础知识专项突破讲与练(北师大版)山西省运城市夏县部分学校2023-2024学年八年级上学期第三次月考数学试题(已下线)专题1-1二次根式(考题猜想,常考易错9个考点40题专练)-2023-2024学年八年级数学下学期期中考点大串讲(人教版)
更新时间:2023-03-21 09:46:30
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解答题-计算题
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【推荐2】阅读下列解题过程,按要求回答问题.
化简:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e5c25a5e7d7731d2922347274cca57.png)
解:原式=
①
=
②
=
③
=
④.
(1)上面的解答过程是否正确?若不正确,指出是哪一步出现错误;
(2)请写出你认为正确的解答过程.
化简:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e5c25a5e7d7731d2922347274cca57.png)
解:原式=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af464fc9051ec5f6975dfc8b5e6d51a0.png)
=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/311c9b463b10d01602453cba084516d1.png)
=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4375637fe529e6fffb134bc90d260d2a.png)
=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/427e880a7289fe39b352a2ec425f7405.png)
(1)上面的解答过程是否正确?若不正确,指出是哪一步出现错误;
(2)请写出你认为正确的解答过程.
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