计算下列各式:
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec03b5287130e940215a197acedfd39.png)
(2)
;
(3)
.
(4)
.
(5)
.
(6)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec03b5287130e940215a197acedfd39.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0b9a205028813b357fd3abbe1105786.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df8aeffec2ad59c487ee7aa6b6b25d53.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81813bc9ac4f41cd7a3bfff75b68de4f.png)
(5)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaf455bf456a1f778294c68a16fa58e.png)
(6)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/175227ae30e9586a83a77a8abafc9401.png)
2023高三·全国·专题练习 查看更多[1]
(已下线)8.8 对数运算及对数函数(精讲)
更新时间:2022-10-28 07:05:30
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解答题-问答题
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【推荐1】已知函数
.
(1)求
;
(2)求函数
的定义域;
(3)证明函数
的奇偶性.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8200e3645e8d247b975bd5c828a39edb.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af49022f7f3814c2071a25b097d6ef6f.png)
(2)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(3)证明函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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解答题-问答题
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适中
(0.65)
【推荐1】设
且
,已知函数
是奇函数
(Ⅰ)求实数
的值;
(Ⅱ)求函数
的单调区间;
(Ⅲ)当
时,函数
的值域为
,求实数
的值.
![](https://img.xkw.com/dksih/QBM/2015/6/29/1572154791010304/1572154796949504/STEM/64a759c37cf2444f9f63c8c28b820cd9.png)
![](https://img.xkw.com/dksih/QBM/2015/6/29/1572154791010304/1572154796949504/STEM/22a7ff71c88b410f8f9c42fa5721dba1.png)
![](https://img.xkw.com/dksih/QBM/2015/6/29/1572154791010304/1572154796949504/STEM/a39ac2bab728456f90f8ca106c19a3ba.png)
(Ⅰ)求实数
![](https://img.xkw.com/dksih/QBM/2015/6/29/1572154791010304/1572154796949504/STEM/375632c22fe44470947258bb32176e6c.png)
(Ⅱ)求函数
![](https://img.xkw.com/dksih/QBM/2015/6/29/1572154791010304/1572154796949504/STEM/cc14b08b1ca34f99bbb461825a398759.png)
(Ⅲ)当
![](https://img.xkw.com/dksih/QBM/2015/6/29/1572154791010304/1572154796949504/STEM/de53cc874d66482695905ca30fc37d0f.png)
![](https://img.xkw.com/dksih/QBM/2015/6/29/1572154791010304/1572154796949504/STEM/cc14b08b1ca34f99bbb461825a398759.png)
![](https://img.xkw.com/dksih/QBM/2015/6/29/1572154791010304/1572154796949504/STEM/7ded698a38c24faea72c64a0adbe2c2f.png)
![](https://img.xkw.com/dksih/QBM/2015/6/29/1572154791010304/1572154796949504/STEM/f748b943bf7a4c498ab3f6b945e6b8cb.png)
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【推荐2】声音通过空气的振动所产生的压强叫做声压强,简称声压,单位为帕(Pa).把声压的有效数值取对数来表示声音的强弱,这种表示声音强弱的数值叫做声压级.声压级以符号
表示,单位为分贝(dB),公式为:
(声压级)
(dB),式中
为待测声压的有效值,
为参考声压,在空气中参考声压
一般取值为
Pa.根据上述材料,回答下列问题:
(1)若某两人小声交谈时的声压有效值
Pa,求其声压级;
(2)已知某班开主题班会,测量到教室内最高声压级达到90dB,求此时该教室内声压的有效值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecbd8cd5345320a56b5672ba122bebbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecbd8cd5345320a56b5672ba122bebbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2013c782db77e1aa36161156722e1d03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c05a19885779617df32077a3e4b6537c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a50a695b2448a4c47425ff5fea990cec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a50a695b2448a4c47425ff5fea990cec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd7b1abd14367500ae01e758e6c042fd.png)
(1)若某两人小声交谈时的声压有效值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7336ffced3d28b41ce154846884f186a.png)
(2)已知某班开主题班会,测量到教室内最高声压级达到90dB,求此时该教室内声压的有效值.
您最近一年使用:0次