11-12高二上·广东湛江·阶段练习
1 . 如果
,那么
的最小值是_________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/871876d9085766a910f2b6735480a373.png)
![](https://img.xkw.com/dksih/QBM/2013/1/3/1571088498614272/1571088503808000/STEM/e63749846fa0413f98401fcddc3164a1.png?resizew=40)
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2010·广东·三模
解题方法
2 . .已知函数
,则
的值为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b05b6df958bbbafb12739d1da56785ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d99181135e70848a91d3812c33c5f86.png)
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名校
3 . 地震震级通常是用来衡量地震释放能量大小的数值,里氏震级最早是由查尔斯•里克特提出的,其计算基于地震波的振幅,计算公式为
,其中
表示某地地震的里氏震级,
表示该地地震台测振仪记录的地震波的最大振幅,
表示这次地震中的标准地震振幅.假设在一次地震中,某地地震台测振仪记录的地震波的最大振幅为5000,且这次地震的标准地震振幅为0.002,则该地这次地震的里氏震级约为( )(参考数据:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adba54bb939c8205a2cbbc2561dfa95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7356ec98b600ece41f3a6b4bc26a7d59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb8f5b560c5cea567a5e5c3462085b43.png)
A.6.3级 | B.6.4级 | C.7.4级 | D.7.6级 |
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名校
4 . 荀子《劝学》中说:“不积跬步,无以至千里;不积小流,无以成江海.”在“进步率”和“退步率”都是
的前提下,我们可以把
看作是经过365天的“进步值”,
看作是经过365天的“退步值”,则大约经过( )天时,“进步值”大约是“退步值”的100倍(参考数据:
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a317f002fd3ae7f3b041d4078e81fe07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dbeaf307f85cae4479a650a543156c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57d2dd0b1b7f9af55c5a285e2bcc0010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae5e71d2fe628229ca104e66474cf53b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27d852f0d11bf042115a268d7452d51f.png)
A.100 | B.230 | C.130 | D.365 |
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5 . 已知函数
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83016b99d34982a8d22712640d5c28f3.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c90ecd2d344e7b1c5ac463f9c9b53a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83016b99d34982a8d22712640d5c28f3.png)
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6 . 若lga(
)与lgb(
)互为相反数,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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10-11高二下·广东佛山·期末
7 . 设![](https://img.xkw.com/dksih/QBM/2012/5/24/1570865048231936/1570865053581312/STEM/4b1e32ed2f0b4a989925cf029b13f2bf.png?resizew=153)
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
______ .
![](https://img.xkw.com/dksih/QBM/2012/5/24/1570865048231936/1570865053581312/STEM/4b1e32ed2f0b4a989925cf029b13f2bf.png?resizew=153)
![](https://img.xkw.com/dksih/QBM/2012/5/24/1570865048231936/1570865053581312/STEM/8621532f85f543d19dae2c4dd86ea220.png?resizew=37)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/362e5f99a8592a7cbfce790fc6881c0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
您最近一年使用:0次
10-11高三·湖南岳阳·阶段练习
解题方法
8 . 已知函数
是
上的偶函数,若对于
,都有
,
且当![](https://img.xkw.com/dksih/QBM/2012/8/21/1570972732727296/1570972738011136/STEM/8d3825df3d9b4eb18161e86aca9e27d5.png)
时,
,则
的值为
![](https://img.xkw.com/dksih/QBM/2012/8/21/1570972732727296/1570972738011136/STEM/0e0eae7fb5274868b21f496f1e74fb3d.png)
![](https://img.xkw.com/dksih/QBM/2012/8/21/1570972732727296/1570972738011136/STEM/252df4acc2554538a81e3ccb2679391a.png)
![](https://img.xkw.com/dksih/QBM/2012/8/21/1570972732727296/1570972738011136/STEM/5adacf8d2b0d4fe9821b5568464baff3.png)
![](https://img.xkw.com/dksih/QBM/2012/8/21/1570972732727296/1570972738011136/STEM/2f7a228b909c49eab2ae777acbd15cf5.png)
且当
![](https://img.xkw.com/dksih/QBM/2012/8/21/1570972732727296/1570972738011136/STEM/8d3825df3d9b4eb18161e86aca9e27d5.png)
时,
![](https://img.xkw.com/dksih/QBM/2012/8/21/1570972732727296/1570972738011136/STEM/2ffb60d4ed734f4090bb328be18f31ad.png)
![](https://img.xkw.com/dksih/QBM/2012/8/21/1570972732727296/1570972738011136/STEM/be53c24b749549b393e994d56875969e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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