定义新运算:对于两个不相等的实数
,我们规定符号
表示
中的较大值,如:
,
.按照这个规定,若
,则
的值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67f0570f04cc4d5321257dbcf0dee4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f59e4fbd62e08f014afb77ce800183a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0a8912ff772c05de8f6f866326243eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85dc7c7e48c150094c06fe17167714bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
A.![]() ![]() | B.![]() | C.![]() | D.![]() ![]() |
更新时间:2024-01-01 20:25:58
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【推荐1】定义:若
,则
,x称为以10为底的N的对数,简记为
,其满足运算法则:
.例如:因为
,所以
,亦即
;
.根据上述定义和运算法则,计算
的结果为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a81d31d3a4bc7c4966bda4c45d3834a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d6a1b0d0f6fc9af7346903bdf12be32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8ccb245042079bba161c53d431a9160.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/797f748921da840facbc4ba2b43bda7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e377c9fbd7c3dd13bbfb773c18e10a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14eae7b4f54e4b438bd707e0fae881ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15987835ab3146e6270ee518f40fc036.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d1807b89e25b7d15a36cb98406222ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77ef3fd0729795951ce3769f6ec90383.png)
A.5 | B.2 | C.1 | D.0 |
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【推荐2】将
的整数部分记为[
],
的小数部分记为{
},易知
(
).若
,那么[
]等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac21cde1e074dd30c087b930c71516c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08bd046e93bb6eba1c82156a4767553a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5df83d33246eb34b26e6f67c731e14d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
A.![]() | B.![]() | C.0 | D.1 |
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【推荐2】解一元二次方程x2-6x-4=0,配方后正确的是( )
A.(x+3)2=13 | B.(x-3)2=5 | C.(x-3)2=4 | D.(x-3)2=13 |
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【推荐1】方程x(x-l)=2(x-l)的根为
A.1 | B.2 | C.1和2 | D.-1和2 |
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【推荐2】三角形两边长分别为3和6,第三边的长是方程x2﹣13x+36=0的一个根,则该三角形的周长为( )
A.13 | B.15 | C.18 | D.13或18 |
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