已知5a-4b=0,则(a+b):(a-b)等于
题目
已知5a-4b=0,则(a+b):(a-b)等于
答案
因为已知条件是5a-4b=0,所以可以得出a=4b/5,在公式(a+b):(a-b)中代入,得-9
所以答案是-9
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