(1)已知:
则
的值是_____
(2)如果记
那么
_____
(3)若
则x=_____
(4)若
则
_____
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58c102574a00e85ec8115ca58d80885a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eef47d81764b9eccd736f651b8797a51.png)
(2)如果记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3f7800fa47f6d0eec7eae02b0bee95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e62b2ef7205da4c32eb68b88c9013fb.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de9a0c01d1d6ae054a4eeeaa4b18371.png)
(4)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d887afdd656d5544ade422d3da796b8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8502753578885e6bd93b3cbb21ea06db.png)
19-20七年级上·上海浦东新·阶段练习 查看更多[4]
上海市浦东新区浦东新区进才实验中学2019-2020学年七年级上学期10月月考数学试题(已下线)考点05 因式分解(考点专练)-备战2021年中考数学考点微专题(已下线)第9章 整式(压轴题专练)-2021-2022学年七年级数学上学期期中期末考试满分全攻略(沪教版)(已下线)专题8.10 幂的运算(全章分层练习)(培优练)-2023-2024学年七年级数学下册基础知识专项突破讲与练(苏科版)
更新时间:2019-11-02 12:48:03
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【推荐2】如图1是长为
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(2)根据(1)中的结论,若
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(3)拓展应用:若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d2a7b13d95229e2e938514739054541.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/18/a73d795f-b753-4e7f-b87d-2447008ef9f2.png?resizew=310)
(1)观察图2,请你写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2811feea06815db84c40cd4c9c6010ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52aa81e175ed76ec0dd3176400326bad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18f0281e6bbdbe08beeccb55adf84536.png)
(2)根据(1)中的结论,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00d816a6e4a5c6375309040fdda0038b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c7e3c0d7c5289a86d7b0ece3bd14ce2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae17c198ff7175a75c194cd81aefe8cb.png)
(3)拓展应用:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d282f35d847b69ffcab0939e1143bb1b.png)
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【推荐1】阅读下面的文字,回答后面的问题:
求
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解:令![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b9d61d583b2d6a8de778aab8b55e772.png)
将等式两边同时乘以5得到:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01fa09c6b57ed0b3bc4d0df4244cca01.png)
②-①得:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4ca91e8457b5a01d6b67bf4d2a2ec1c.png)
∴
即![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05b6fac87e6b28d2bd6e9272568e68fc.png)
问题:(1)求
的值;
(2)求
的值.
求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82735f970d8ba979d2986633cd7310ec.png)
解:令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b9d61d583b2d6a8de778aab8b55e772.png)
将等式两边同时乘以5得到:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01fa09c6b57ed0b3bc4d0df4244cca01.png)
②-①得:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4ca91e8457b5a01d6b67bf4d2a2ec1c.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7bb0a91463180d72b4232d0c50dc82c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05b6fac87e6b28d2bd6e9272568e68fc.png)
问题:(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6075e5a6d74245ea3a6b419e446dc02d.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f7845bc7eaf0cef25e821d4070c81e.png)
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名校
【推荐3】阅读下列材料:一般地,n个相同的因数a相乘
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且
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(1)计算以下各对数的值:
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=_____.
(2)写出(1)
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、
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_____(
且
,
,
).
(4)设
,
,请根据幂的运算法则以及对数的定义说明上述结论的正确性.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17adf19ba51a88c75cda3b8befbc66cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81baf482546f298ba289d723bc21e0c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6906204437bea494c1901bfe5c8be7a4.png)
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(1)计算以下各对数的值:
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1eafa76bfa24972cd7dc5f8a997c4828.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cc110fded898187721ad59de2d0b13f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1eafa76bfa24972cd7dc5f8a997c4828.png)
(3)由(2)的结果,请你能归纳出一个一般性的结论:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c8ac54da1102fdb0e66f916d48a185c.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d41fb176810853d3d0debfd39a598c.png)
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