用1,2,3,4,5,6,7,8,9这九个数字写出三个大小相等的分数.(每个数字只允许用一次). 例如:3/6=7/14=29/58.
问题描述:
用1,2,3,4,5,6,7,8,9这九个数字写出三个大小相等的分数.(每个数字只允许用一次).
例如:
=3 6
=7 14
. 29 58
答
符合条件的分数有:
(1)
=3 21
=7 49
;8 56
(2)
=3 6
=7 14
;29 58
(3)
=3 6
=9 18
;27 54
(4)
=3 27
=6 54
; 9 81
(5)
=2 4
=3 6
.(答案不唯一)79 158