标题: 题目没看懂。 [打印本页] 作者: kun861010 时间: 2009-12-9 07:13 标题: 题目没看懂。 Which of the following procedures is always equivalent to adding 5 given numbers and then dividing the sum by 5 ? I. Multiplying the 5 numbers and then finding the 5th root of the product. II. Adding the 5 numbers, doubling the sum, and then moving the decimal point one place to the left. III. Ordering the 5 numbers numerically and then selecting the middle number. (A) None (B) I only (C) II only (D) III only (E) I and III
这道题目没看懂。作者: lifeten 时间: 2009-12-9 08:17
题目是说把5个数加起来除以5，也就是5个数的平均数，问跟下面哪个相等 I. 5个数相乘开5次方 II. 5个数相加， 然后乘以2，再除以10 III. 排序，去中间一个，也就是中数