原来四个数的平均数是多少
- 时间:2020-05-31 15:41:53
- 分类:数学世界
- 阅读:181 次
有四个数,用其中3个数的平均数,再加上另外的一个数,按这样的方法计算,分别得到:28、36、42、46,那么原来四个数的平均数是多少?
数学题解答:假设28是甲乙丙的平均数+丁,36是甲丙丁的平均数+乙,42是甲乙丁的平均数+丙,46是乙丙丁的平均数+甲,将这四个数加起来,所得的和中包含了两次甲乙丙丁的和,所以这四个数的平均数可以这样算:
28+36+42+46=152
152÷2=76…………四个数的和
76÷4=19…………四个数的平均数
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