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更新时间:2024-04-08 13:38:30
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【推荐2】用“☆”定义一种新运算:对于任意有理数a和b,规定a☆b=
,
(1)计算:(-6)☆5=_______ .
(2)从-9,-8,-7,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7,8,9中任选两个有理数做a,b
的值,并计算a☆b,那么所有运算结果中的最大值是_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1b70763c7c824376769932b6f12ad3.png)
(1)计算:(-6)☆5=
(2)从-9,-8,-7,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7,8,9中任选两个有理数做a,b
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acd229b508a9dd57f583fcbb411cd615.png)
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【推荐2】对于任意一个三位自然数
,若十位数字等于百位数字与个位数字的和减
,我们称这个三位数为“减
数”.例如:
,
.最大的“减
数”是_____ ,三位数
是“减
数”,记
,
,若
能被
整除,则满足条件的M的最大值是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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