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20-21高一下·河南省直辖县级单位·期末 查看更多[5]
河南省济源市第五中学2020-2021学年高一下学期期末数学试题吉林省长春市榆树市第一高级中学校2021-2022学年高一上学期期中数学试题(已下线)突破4.3 对数 (1)(已下线)突破4.3 对数 (1)(已下线)突破4.3 对数(课时训练)-【新教材优创】突破满分数学之2022-2023学年高一数学重难点突破+课时训练 (人教A版2019必修第一册)
更新时间:2021-09-14 09:16:59
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【推荐1】已知
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/918333acdd81e0f44f475b7b66e399ca.png)
___________ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a94aecd1d670b82408375d01142242.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0317d5211e6afbf1ae502088b3ce1cf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/918333acdd81e0f44f475b7b66e399ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a94aecd1d670b82408375d01142242.png)
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【推荐1】对数
(1)对数的概念:一般地,如果
(
,且
),那么数x叫做以a为底N的对数,记作
,其中a叫做对数的底数,N叫做______ .
(2)常用对数和自然对数
①常用对数:通常,我们将以10为底的对数叫做常用对数,并把
记为______ .
②自然对数:无理数e=2. 718 28…,以e为底的对数称为自然对数,并把
记为_____ .
(3)对数与指数间的关系:当
,
时,
. 负数和0没有对数;
,
.
(4)对数的运算性质:如果
,且
,
,
,那么
①
=_______ ;
②
=________ ;
③
=________ (
).
根据性质③又可得对数换底公式:
(
,且
;
,且
).
(1)对数的概念:一般地,如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b5a213235f7d61e6b1c4663ad8d773.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9057739b0e72e972943cafa8e8d675f.png)
(2)常用对数和自然对数
①常用对数:通常,我们将以10为底的对数叫做常用对数,并把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aef329119ee1ffd0f2c27d1a1ab1f017.png)
②自然对数:无理数e=2. 718 28…,以e为底的对数称为自然对数,并把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff0471060897a8ebcf5fa08a834eaf98.png)
(3)对数与指数间的关系:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9b7f624293b22d9c1bf17b689113400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a89b886328d80d2bbf1c7f0cb55821.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22f60a79a8cf75c39f5ddf231bf23280.png)
(4)对数的运算性质:如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2480f87a11c4cd450bc9454ea7276722.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2a891d21bb2c7a11304beaab5054074.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc835f59bfb5c10f9fbef332f8658295.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28f01edcce2cc850ab91a6e5058a76fd.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26e2e0913129ece60ac3391a87e6c7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8440725e1df5ca0990b572dd84127914.png)
根据性质③又可得对数换底公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccc0844bf035915f388b2dc2846dc10e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34c57cd45ebfc350cf2bee138f1f0d71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f940e491269e04ab4680ee10714ba88c.png)
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【推荐2】基本性质:(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2963db60d0f9dbd98992977d28ee858e.png)
____ ;(2)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29c1d55b61e1427ac4061da73e1e7f71.png)
____ ;(3)负数和0没有_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2963db60d0f9dbd98992977d28ee858e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29c1d55b61e1427ac4061da73e1e7f71.png)
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