A、B、C、D四个数,两两配对可以成六对.这六对数的平均数分别是12,13,15,17,19,20.请你先想一想,是怎样配对的,并求原来四个数的平均数.
人气:308 ℃ 时间:2020-02-01 09:43:41
解答
(12+13+15+17+19+20)×2÷3÷4
=96×2÷3÷4
=64÷4
=16
答:原来四个数的平均数是16.
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