Set (x, 4,7, 14, 18), 求x.
1) median=7,
2) 最大减去最小=14。
条件1加条件2不就可以说明x小于7, 那么只能是18最大, x=4.吗
可答案是E.
The average (arithmetic mean)of M consecutive odd integers is 10. What is the smallest number in the sequence?
1) The range of the M consecutive odd integers is 14.
2) The greatest number of the M consecutive odd integers is 15.
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对于第二个
条件1可以得出他们的个数啊,结合他们的平均值就可以知道了啊
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