“十一”黄金周期间,小佳和妈妈乘火车外出旅游,小佳希望和妈妈的座位连在一起,且能坐在靠窗的位置.如果某列火车的座位排列方式如图所示,那么下列座位号码符合小佳要求的是( )
车 窗 | 1 | 2 | 3 | 过 道 | 4 | 5 | 车 窗 |
6 | 7 | 8 | 9 | 10 | |||
11 | 12 | 13 | 14 | 15 | |||
16 | 17 | 18 | … | … | |||
… | … | … | … | … |
A.28,29 | B.45,46 | C.50,51 | D.64,65 |
更新时间:2023-11-11 11:14:32
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适中
(0.65)
【推荐1】把所有正偶数从小到大排列,并按如下规律分组:
,
,6,
,
12,14,16,
,
22,24,26,28,30,
,
,现用等式
表示正偶数 M 是第i 组第 j 个数
从左往右数
,如
,则
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单选题
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适中
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【推荐2】我们知道,一元二次方程
没有实数根,即不存在一个实数的平方等于
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有一个根为i),并且进一步规定:一切实数可以与新数进行四则运算,且原有的运算律和运算法则仍然成立,于是有
,
,
,
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