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 ____.

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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 ____.
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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 possible
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 ____.
我就不直译了.
（a,b,c）对应（1,2,3）.问在所有可能的（a,b,c）的排列组合里,式子[(a-b)+(b-c)]的平均值是____.
(a-b)+(b-c)=a-c
a的平均值是2,c的平均值也是2.所以答案是0.
由于a,b,c是轮换对称的,因此式子(ma+nb+kc)=2(m+n+c)...

在（AB）的+平均值（前）在所有可能的安排（1，乙，丙三个数字（1,4,7））是____。

从三个数1、4、7中分别选择a, b, c，然后计算式子(a-b) +(b-c)，最后计算所有式子的平均值

above the average and below the average. beyond average还是beyond the average? take the average average man in the average average average average AVERAGE 英语翻译the weight average molecular weightthe number average molecular weight an average of 和the average of的区别 the average of和 a average of 有区别吗 valu for money on average、on the average和on an average有何区别 最好举几个例子 On the average中的the能否省略? what is the average salary in china beyond the reach of those with average average man in the street 意思?