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从l,2,3…n中,任取57个数,使这57个数必有两个数的差为l3,则n的最大值为()
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已知Mab是平面直角坐标系xOy中的点其中a是从l234三个数中任取的一个数b是从l2345四个数中
5
4或5
5或6
6或7
从24816这4个数中任取两个不同的数相乘可以得到______个有别于已知数的不同乘积
2
3
5
7
从012这三个数中任取一个数作为点P.的横坐标再从剩下的两个数中任取一个数作为点P.的纵坐标则点P.
能否把1122335050这100个数排成一行使得两个1之间夹着这100个数中的一个数两个2之间夹
从012345这六个数字中任取两个奇数和两个偶数组成没有重复数字的四位数的个数为
300
216
180
162
已知Mab是平面直角坐标系xOy中的点其中a是从l234三个数中任取的一个数b是从l2345五个数中
5
4或5
5或6
6或7
从012345这六个数字中任取两个奇数和两个偶数组成没有重复数字的四位数的个数为________.
在1239这9个自然数中任取3个数1求这3个数恰有1个偶数的概率2记X.为3个数中两数相邻的组数例如
如果从-2134四个数中任取一个数作为a从-2l4三个数中任取一个数作为b将取出的a和b两个数代入二
已知Mab是平面直角坐标系xOy中的点其中a是从l234三个数中任取的一个数b是从l2345四个数中
5
4或5
5或6
6或7
从123n中任取57个数使这57个数必有两个数的差为13则n的最大值为.
从{12318}中任取两个不同的数则其中一个数恰好是另一个数的3倍的概率为.
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在-23-4-56这五个数中任取两个数相乘得的积最大的是
10
20
-30
18
在-23-4-56这五个数中任取两个数相乘所得的积最大的是
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﹣30
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从1~4这4个数中任取一个数作分子从2~4这3个数中任取一个数作分母组成一个分数则出现分子分母互质
从12NN>3这N个数中任取三个数记这三个数中中间大小的数为X则随机变量X的分布律PX=k=____
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10
20
﹣30
18
在1239这9个自然数中任取3个数.1求这3个数中恰有1个偶数的概率2记X.为这3个数中两数相邻的组
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中国骑兵的历史始于春秋战国时期赵武灵王胡服骑射是骑兵日趋重要的反映但当时骑兵非常辛苦只能依靠双腿的力量夹紧驰骤颠簸的马匹以保持平衡西汉中期西南边陲的滇国骑兵开始普遍使用一种特殊的马镫它使上马和骑乘时有了一个很好的着力点马鞍前沿两侧各系有一根下垂至马腹前侧的绳子绳端结成圆圈状骑马者双脚的大拇指各伸入一圈蹬向马腹前方这种绳圈式马镫的图像时常出现在滇国的青铜器上3世纪左右一种更为方便简洁的上马搭足用的铁马镫在中华大地上出现长沙金盆岭西晋墓骑马陶俑的单马镫再现了这段历史这些陶俑的马镫仅出现在左侧而且乘马者的脚也没踏在镫里表明这个马镫是供上马时蹬踏之用下列说法与这段文字相符的是
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