(4y的平方-x的平方)/(-x的平方+4xy-4y的平方)约分,

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(4y的平方-x的平方)/(-x的平方+4xy-4y的平方)约分,

(4y^2-x^2)/(-x^2+4xy-4y^2)
=(x^2-4y^2)/(x^2-4xy+4y^2)
=(x-2y)(x+2y)/(x-2y)^2
=(x+2y)/(x-2y)