化简(2x-3y)(2x+3y)(9y^2+4x^2)-(4x^2-9y^2)^2
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化简(2x-3y)(2x+3y)(9y^2+4x^2)-(4x^2-9y^2)^2
化简(2x-3y)(2x+3y)(9y^2+4x^2)-(4x^2-9y^2)^2
化简(2x-3y)(2x+3y)(9y^2+4x^2)-(4x^2-9y^2)^2
(2x-3y)(2x+3y)(9y^2+4x^2)-(4x^2-9y^2)^2
=(4x^2-9y^2)(9y^2+4x^2)-(4x^2-9y^2)^2
=(4x^2-9y^2)[(9y^2+4x^2)-(4x^2-9y^2)]
=18y^2(4x^2-9y^2)
=18y^2(2x-3y)(2x+3y)
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