1 . 阅读下列材料,并解决后面的问题.
材料:一般地,
个相同的因数
相乘:
记为
.如
,此时,3叫做以2为底8的对数,记为
(即
.一般地,若
且
,
,则
叫做以
为底
的对数,记为
(即
.如
,则4叫做以3为底81的对数,记为
(即
.
问题:
(1)计算以下各对数的值:
;
;
.
(2)通过观察(1),请直接写出
、
、
之间满足的等量关系是 .
(3)请你求出
的值:
材料:一般地,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab1b363c5aa2bd28ca3ca79375b18f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81baf482546f298ba289d723bc21e0c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feae878a430a1b23774127547d842cb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd7db82a3e9a06d55b5e90d0aade9c64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce79792f69aad3da7d83c7c278fa38c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d5477eb21f0f96ad5e54fc8904c1235.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04174f3c9351bc05bcf604d18ab8c44c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.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/22cbe3b3f024664dcd8c02b25c6a24c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33e6dde516ba8b912a4a1fad68bbb1fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14f48b3a441172a0073be2877988167b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a51f777955a15322356102ef16cdce20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7cbf511b12743a4ab36b9df2c5a095e.png)
问题:
(1)计算以下各对数的值:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc6a0713917c995c9cba31fdab2bd766.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53ab920d25e5fdabf14558f50abc401.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe420c97c1055c3e7bd86ec10baf1fa.png)
(2)通过观察(1),请直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea73a4be0097c5057f5219dc9f01290a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7596013c17c7ab1b77da624a51ab4d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3323371c151977438805b7e97a30b289.png)
(3)请你求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ff1321933cc2972e16af7c6c4417acb.png)
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2 . 长方体的长是
厘米,宽是
厘米,高是
厘米,那么它的体积是_________ 立方厘米.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3faac9ef6184fd1a240b72303bf78d75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cffb7a3c8758146bc13eebcfe11aa1f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35c509355ea0e9f93b5b2e7bf18fc8ce.png)
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3 . 已知,m、n是有理数,且
,则
的算术平方根是____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35bec8058ab385bd95e22e3a91340fa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0bade0ec5ffd0e8fe55c380d792fc58.png)
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名校
4 .
的个位数字为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbd9ee9a2dff35b23c132a339a6e6530.png)
A.1 | B.3 | C.7 | D.9 |
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5 . 某种细菌每分钟分裂成3个,一个细菌经过3分钟分裂,再继续分裂t分钟后共分裂成( )个.
A.![]() | B.![]() | C.![]() | D.![]() |
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6 . 类比平方根(二次方根)、立方根(三次方根)的定义可给出四次方根、五次方根的定义:
①如果
,那么x叫做a的四次方根;
②如果
,那么x叫做a的五次方根;
请根据以上两个定义并结合有关数学知识回答问题:
(1)81的四次方根为______;
的五次方根为______.
(2)若
有意义,则a的取值范围为______;若
有意义,则a的取值范围为______.
(3)解方程:
①![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87a02d6c7a7f2cb4c2d2552efabb8ccf.png)
②
①如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/613309a7ee1b8ad9337eef0061c37e4b.png)
②如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecbd3fe012ac75918fa6b17d7c848612.png)
请根据以上两个定义并结合有关数学知识回答问题:
(1)81的四次方根为______;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c1dfc770fc27e0b9bf602ec2f842ae9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31405ff529f703d4555787091ffd4582.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb59c91f9a00b5285a71bf442b19554f.png)
(3)解方程:
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87a02d6c7a7f2cb4c2d2552efabb8ccf.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb6cb0dbdd9e6a969ebeb4931f74160.png)
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2024-04-18更新
|
203次组卷
|
2卷引用:重庆市梁平区梁平区福德学校2023-2024学年七年级下学期第一次月考数学试题
7 . 一个正方体的棱长扩大3倍,则它的体积扩大______ 倍.
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8 . 幻方的历史很悠久,传说最早出现在夏禹时代的“洛书”(如图1).把洛书用今天的数学符号翻译出来,就是一个三阶幻方(如图2),将9个数填在
(三行三列)的方格中,如果满足每个横行、每个竖列、每条对角线上的三个数字之和都相等,就得到一个广义的三阶幻方.图3的方格中填写了一些数字和字母,若能构成一个广义的三阶幻方,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8b64a9788cdfdd40fa3495b9cafc5ac.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/777d8fccf0cf8b55a68488fe48b78744.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8b64a9788cdfdd40fa3495b9cafc5ac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/29/4267e9fb-12fd-484c-9f3e-e07cc2e0a7fe.png?resizew=352)
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9 . 若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846c4ca23e4df92e6844802b85476499.png)
_____
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0906e1de4c11cc9fa6046077087e4933.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846c4ca23e4df92e6844802b85476499.png)
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2024-03-16更新
|
373次组卷
|
3卷引用:广东省广州市增城区新星学校2023-2024学年七年级下学期月考数学试题
10 . 《庄子》中记载:“一尺之捶,日取其半,万世不竭.”这句话的意思是一尺长的木棍,每天截取它的一半,永远也截不完.若按此方式截一根长为1的木棍,第6天截取后木棍剩余的长度是__________ .
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