(4x^2-y^2)^2可化简为（2x+y)^2 * (2x-y)^2
(-2x+y分之4x^2-4xy+y^2)^3可化简为{ -2x+y分之（2x-y)^2}^3 简化为 {-（2x-y）}^3
然后相除得到 -（2x-y）分之（2x+y）^2
(4x^2-y^2)^2除以(-2x+y分之4x^2-4xy+y^2)^3 ,计算题
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