(4x^2-25y^2)除以（2x-5y)
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(4x^2-25y^2)除以（2x-5y)(4x^2-25y^2)除以（2x-5y)(4x^2-25y^2)除以（2x-5y)(4x^2-25y^2)除以（2x-5y)=(2x)^2-(5y)^2除以
(4x^2-25y^2)除以（2x-5y)
(4x^2-25y^2)除以（2x-5y)
(4x^2-25y^2)除以（2x-5y)
(4x^2-25y^2)除以（2x-5y)
=(2x)^2-(5y)^2除以（2x-5y)
=(2x+5y)(2x-5y)除以（2x-5y)
=2x+5y
= 2x+5y