规定:logab(a>0,a≠1,b>0)表示a,b之间的一种运算,现有如下的运算法则:logaan=n, logNM=
(a>0,a≠1,N>0,N≠1,M>0).例如:log223=3,log25=
,则log1001000=( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e64e4bbca1bbd6b53d6e41b83bc44e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/693fa9bd1ab23da3361792f927324d14.png)
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更新时间:2018-07-01 23:17:57
|
【知识点】 新定义下的实数运算
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【推荐1】一般地,如果
(
为正整数,且
,那么
叫作
的
次方根.例如:
,
的四次方根是
.则下列结论:①3是81的四次方根;②任何实数都有唯一的奇次方根;③若
,则
的三次方根是
;④当
时,整数
的二次方根有4052个.其中正确的个数是( )
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【推荐2】对
定义一种新运算
,规定:
(其中
均为非零常数),这里等式右边是通常的四则运算.例如:
,若
,
,则下列结论正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
,
;
若
,则
;
若
,则
有且仅有
组整数解;
若无论
取何值时,
的值均不变,则
;
若
对任意有理数
都成立,则
.
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