化简求值【(3x+2y)(3x-2y)-(x+2y)(5x-2y)】÷4x,其中x=2,y=1

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化简求值【(3x+2y)(3x-2y)-(x+2y)(5x-2y)】÷4x,其中x=2,y=1
化简求值【(3x+2y)(3x-2y)-(x+2y)(5x-2y)】÷4x,其中x=2,y=1

化简求值【(3x+2y)(3x-2y)-(x+2y)(5x-2y)】÷4x,其中x=2,y=1
【(3x+2y)(3x-2y)-(x+2y)(5x-2y)】÷4x
=[9x²-4y²-(5x²-2xy+10xy-4y²)]÷4x
=(4x²-8xy)÷4x
=x-2y
=2-2×1
=0