4x^2y^2+9+8xy-x^2-4y^2
=(4x^2y^2+9+12xy)-x^2-4y^2-4xy
=(2xy+3)²-(x+2y)²
=(2xy+x+2y+3)(2xy-x-2y+3)
因式分解4x^2y^2+9+8xy-x^2-4y^2
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