说明:有1、2、3、4个数字,能组成多少个互不相同且无重复数字的三位数?都是多少? -1,2,3,4 numbers can be formed with each other with no repeating three-digit numbers? How many are? <邓伟健> 在 2024-12-28 上传
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说明:一般数学公式的建立和操作,简单的和复杂的都有,你可以根据你的需要选择。-General mathematical formula for the establishment and operation of both simple and complex, you can choose according to your needs. <邓伟健> 在 2024-12-28 上传
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说明:两个乒乓球队进行比赛,各出三人。甲队为a,b,c三人,乙队为x,y,z三人。已抽签决定 -Two table tennis team for the game, each out of three people. A team for a, b, c three, b team for the x, y, z three people. Have a lottery <邓伟健> 在 2024-12-28 上传
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说明:有一分数序列:2/1,3/2,5/3,8/5,13/8,21/13...求出这个数列的前20项之和。 -A score sequence: 2/1, 3/2, 5/3, 8, 5, 13, 8, 13... The sum of the top 20 of the sequence of items. <邓伟健> 在 2024-12-28 上传
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说明:Gaussian noise refers to its obey gaussian probability density function (i.e., normal distribution) of the noise. If a noise, its amplitude distribution obeys the gaussian distribution, and its power spectral density is <朱健晨> 在 2024-12-28 上传
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