GRE数学中的 The range 值域?定义域?
问题描述：
GRE数学中的 The range 值域?定义域?
就比如一句话中“the range of the five number is 2 or more” 这里的range是指值域还是定义域?
可参照猴哥数学112道难题中的第48题“if the average of x,y,z,5,and 7 is 8,which of the following must be true?① themedian of the five numbers cannot be 5.② at least one of x,y,z is greater than 9.③the range of the five numbers is 2 or more”——> 答案是②③.
答
The range 是最大值和最小值的差,因为这5个数中有5和7了,那么最大值一定不小于7,最小值不大于5,所有range肯定大于等于2