The average value of (a-b) +(b-c) over all possible arrangement (a,b,c) ...The average value of (a-b) +(b-c) over all possible arrangement (a,b,c) of the three numbers (1,4,7) is ____.

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The average value of (a-b) +(b-c) over all possible arrangement (a,b,c) ...The average value of (a-b) +(b-c) over all possible arrangement (a,b,c) of the three numbers (1,4,7) is ____.

The average value of (a-b) +(b-c) over all possible arrangement (a,b,c) ...The average value of (a-b) +(b-c) over all possible arrangement (a,b,c) of the three numbers (1,4,7) is ____.
The average value of (a-b) +(b-c) over all possible arrangement (a,b,c) ...
The average value of (a-b) +(b-c) over all possible arrangement (a,b,c) of the three numbers (1,4,7) is ____.

The average value of (a-b) +(b-c) over all possible arrangement (a,b,c) ...The average value of (a-b) +(b-c) over all possible arrangement (a,b,c) of the three numbers (1,4,7) is ____.
六种排列组合 分别算下呗
(1,4,7)---(-6)
(1,7,4)---(-3)
(4,1,7)---(-3)
(4,7,1)---(3)
(7,4,1)---(6)
(7,1,4)---(3)
是0
也可以这样想
a,b,c分别出现1,4,7都是两次 所以
(a-b)+(b-c)=a-c
平均值就是(1+4+7)*2-1+4+7)*2=0

The average value of (a-b) +(b-c) over all possible arrangement (a,b,c) ...The average value of (a-b) +(b-c) over all possible arrangement (a,b,c) of the three numbers (1,4,7) is ____. 英译中:The average value of (a-b) +(b-c) over all possibleThe average value of (a-b) +(b-c) over all possible arrangement (a,b,c) of the three numbers (1,4,7) is ____. 英译中:The average value of (a-b) +(b-c) over all possibleThe average value of (a-b) +(b-c) over all possible arrangement (a,b,c) of the three numbers (1,4,7) is ____. What is the average length of people's penis in China?Does the value vary significantly in different areas? what is the average(mean) value of 2t-3t+4 over interval -1≤t≤1? the value of the value of time the value of an average of 和the average of的区别 the average of和 a average of 有区别吗 find the average calue of the function y=x^2+x+2 from x=0 to x=4.value not calue If the function f given by f(x)=x3 has an average value of 9 on the closed interval [0,k],then k=? 英语翻译The average surface roughness inside the microchannels was in the range of 100–150 nmfor a value of the relative roughness of the order of 7 * 10-4(e/Dh). cut the value of its average merit scholarships by about one-third中的by是怎么用的?cut the value of its average merit scholarships by about one-third and reduce the number of recipients,pouring the savings,about $2.5 million,into need-based ai the value of red blood Value Of The Man 歌词 play the maximum value of beyond the reach of those with average