这是陈向东练习册里P134第23题：It the average (arithmetic mean) of x,y,z,

来源：学生作业帮编辑：搜搜做题作业网作业帮分类：英语作业时间：2024/05/16 15:29:49

这是陈向东练习册里P134第23题：It the average (arithmetic mean) of x,y,z,5,and 7 is 8,which of the following must be true?II.at least one of x,y,and z is greater than 9.III.the range of the five numbers is 2 or more.答案是以上两个都对.我很郁闷,我觉得都不对啊：II.没有提示说x,y,z 都是整数,即使平均数8,必然x、y、z必然有一个大于8,可是可以小于9啊,如果可以不是整数的话.III.即使xyz都是整数,那么II就是对的,range是最大数与最小数之差么?那么最小的range也得是9-5=4,[em59]

XYZ不一定是整数,五个数平均为8,其中两个为5,7,则三个数平均为28.28/3=9.333333.均值都大于了9,必然有一个数是要大于9的关于第三个选项,OR~OR~OR~举个例子,“4大于或者等于1”,这个结论是对的.查看原帖

这是陈向东练习册里P134第23题：It the average (arithmetic mean) of x,y,z, If w = x + y + z,what is the average (arithmetic mean) of w, the average (arithmetic mean) of x,y,z,5,and 7 is 8 还是这个问题 if the average (arithmetic mean) of x,y,z,5,and 7 is 8,which 英语翻译If w=x+y+z,what is the average(arithmetic mean) of w,x,y The average (arithmetic mean) of a list of numbers is what p If the average(arithmetic mean) of 11 numbers,each of which What is the average (arithmetic mean) of all the multiples o If the average(arithmetic mean)of 7 consecutive numbers is 1 1.If the average (arithmetic mean) of 3,8,and w is greater t 英语写的数学题急12.The average (arithmetic mean) of three consecuti If 4 bags of flour with an average(arithmetic mean) weight o