设a>b>0,a^2+b^2=2.5ab,则(a+b)^2/(a-b)^2的值等于
4个回答
a^2+b^2=2.5ab
(a+b)^2=4.5ab
(a-b)^2=0.5ab
所以(a+b)^2/(a-b)^2=9
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