a比b等于3比5,a比[b-a]等于多少

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因为 a :b = 3 :5
所以设 a = 3k ,b = 5k
则 b - a = 5k - 3k = 2k
a :(b - a) = 3k :2k = 3 :2
======以下答案可供参考======
供参考答案1:
3比2供参考答案2:
因为 a : b = 3 : 5
所以设 a = 3k , b = 5k
则 b - a = 5k - 3k = 2k
a : (b - a) = 3k : 2k = 3 : 2
3比2