-4x^2y^2+25/9a^2b^2

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-4x^2y^2+25/9a^2b^2-4x^2y^2+25/9a^2b^2-4x^2y^2+25/9a^2b^2原式=(5/3ab)²-(2xy)²=(5/3ab+2xy)(5/

-4x^2y^2+25/9a^2b^2
-4x^2y^2+25/9a^2b^2

-4x^2y^2+25/9a^2b^2
原式=(5/3ab)²-(2xy)²
=(5/3ab+2xy)(5/3ab-2xy)