名校
1 . 计算:
(1)
;
(2)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c921d97291b173550830515a6369ffc.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4250371289fcfe6f3fa4b4aa17d2b7c.png)
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2 . 计算:
(1)
.
(2)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f05664fdf70da83a5e1ac0c2618b012.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/986492012886e5b34d9e6c899bfcb6ca.png)
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3 . 计算:
(1)
.
(2)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e4b05bd0c56c7b456506e63b5d51b5b.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8af4542936f91b368728796ac3a47a84.png)
您最近一年使用:0次
2024-04-24更新
|
40次组卷
|
2卷引用:浙江省杭州市大关中学2023-2024学年八年级下学期数学3月月考试题
2024八年级下·浙江·专题练习
4 . 已知实数m使得
成立,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eae3b8e22764a08b1da737c87494661.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/704133d6801978496db354d583111e7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eae3b8e22764a08b1da737c87494661.png)
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2024八年级下·浙江·专题练习
5 . 化简求值:
,其中
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4078d8c54343d23dbe859b0ecc7597b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74490a23cd584fd39cea93ca3ca07106.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c50866229ec5a3640fb250f9bd2192b3.png)
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2024八年级下·浙江·专题练习
6 . 已知
.
(1)求
的值;
(2)化简并求值:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80236b37de6f299b5ff05d1ff29850c2.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f4eb115ced748cb357c674bf1a1110a.png)
(2)化简并求值:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29d0abb04efa7a4af48a02ec17c6b3b4.png)
您最近一年使用:0次
2024-04-19更新
|
139次组卷
|
4卷引用:专题02 二次根式的混合运算及化简求值(6题型)【好题汇编】-备战2023-2024学年八年级数学下学期期中真题分类汇编(浙教版)
(已下线)专题02 二次根式的混合运算及化简求值(6题型)【好题汇编】-备战2023-2024学年八年级数学下学期期中真题分类汇编(浙教版)(已下线)专题19.20 二次根式的化简求值50题(分层练习)(提升练)-2023-2024学年八年级数学下册基础知识专项突破讲与练(苏科版)(已下线)专题5.21+分式的化简求值精选100题(分层练习)1(综合练)-2023-2024学年八年级数学下册基础知识专项突破讲与练(北师大版)(已下线)考题猜想 12-1 二次根式(9种计算题)-2023-2024学年八年级数学下学期期末考点大串讲(苏科版)
2024八年级下·浙江·专题练习
7 . 阅读下面问题:
;
;
.
猜测:
(1)
的值;
(2)
(
为正整数)的值.
(3)根据你的猜测计算:
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f46d2748c9411018b3bb2134cbd662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca84e2db65efe3647aba894f55071678.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/376f543c6960dfb8006d440fb6487988.png)
猜测:
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17f7705762be458593f83f82bac2ebd6.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42388221a8b19545db7aa38fdf50d129.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(3)根据你的猜测计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f954a604defc62a354ad5177f0ac0a94.png)
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8 . 阅读材料,并解决问题:定义:将分母中的根号化去的过程叫做分母有理化.
如:将
分母有理化,解:原式
.
运用以上方法解决问题:
已知:
,
.
(1)化简
;
(2)求
的值.
如:将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23c7151d313ef6d1c06ec752dd078647.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5611cef5c0b1f354e8d68bd7defe089.png)
运用以上方法解决问题:
已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e51f77003b13b76b70515da63285dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fa360c94923f1f594961a1a5c9f6af.png)
(1)化简
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22b4218f00da487d3f63b9360144708f.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/133c679bab223516b43716ac5379bd3f.png)
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9 . 若规定符号“*”的意义是
,则
的值是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8313d5f234e80f717be1176939672712.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2c3187df1d69a21f12a9af0c8f391e9.png)
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2024八年级下·浙江·专题练习
10 . 先阅读下面材料,再解答问题:
材料:任意一个有理数与无理数的和为无理数,任意一个不为零的有理数与一个无理数的积为无理数,而零与无理数的积为零.由此可得:若
,其中
,
为有理数,
是无理数,则
,
.
证明:∵
,
为有理数,
∴
是有理数,
∵
为有理数,
是无理数,
∴
,
∴
,
∴
.
(1)若
,其中
、
为有理数,则
,
;
(2)已知
的整数部分为
,小数部分为
,求
与
的值;
(3)在(2)的条件下,
,
为有理数,
,
,
,
满足
,求
,
的值.
材料:任意一个有理数与无理数的和为无理数,任意一个不为零的有理数与一个无理数的积为无理数,而零与无理数的积为零.由此可得:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b580d28a0155fbf7c358eadef3f95feb.png)
![](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/a84dba41a7a4a57ca08a148e35e6971e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/143b917df0520097be222accbddf9394.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b580d28a0155fbf7c358eadef3f95feb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c84e088e26df4551ccc2bc553b7f8ac.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a84dba41a7a4a57ca08a148e35e6971e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/143b917df0520097be222accbddf9394.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/437672771d61c170cf6c01bc046e140f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2f250843edbfeff027d9454373be5e.png)
![](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/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a68c1d20a422a363e356a160f096503c.png)
![](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/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(3)在(2)的条件下,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](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/b6f97073b4464172cf2e3c010f7955e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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