其實只要你假設a = 1就好易睇得到
a = 2b ; a = 3c
如果a = 1, 那樣 b = 1/2 & c = 1/3
所以 a:b:c = 1: 1/2 : 1/3
又或者3個都乘6 (ratio 可以咁做), 所以 a:b:c = 6:3:2
2個ans都岩.....
如果另一題如下
a = 3b ; b = 2c
正確既算式係咁樣
b= 1/3 a
c = 1/2 b = (1/2)(1/3) a = 1/6 a
所以 a : b : c = a : (1/2) a : (1/6) a = 1 : 1/2 : 1/6
或者你好似上面既想法咁, 考慮 a=1, 咁就好易睇到個ans出黎....