解
(a²+b²)²-4a²b²——这个吧
=(a²+b²)²-(2ab)²
=(a²+2ab+b²)(a²-2ab+b²)
=(a+b)²(a-b)²没有平方的，就是a^2+b^2-4a^2b^2=没有平方，没法分解
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