Use the 9 numbers 1, 2, 3, ..., 9 to write 3 fractions of equal size, each number is only allowed once, for example (3/6)=(9/18)=(27/54) ． How many solutions can you find in total?
用1、2、3、…、9这9个数字，写出大小相等的3个分数，每个数字只许用一次，例如(3/6)=(9/18)=(27/54)．你一共可以求出多少解？
<result>5</result>