化简求值（3x+2y-1)（3x-2y+1）-(x+y)(x-y)

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化简求值（3x+2y-1)（3x-2y+1）-(x+y)(x-y)

化简求值（3x+2y-1)（3x-2y+1）-(x+y)(x-y)
化简求值（3x+2y-1)（3x-2y+1）-(x+y)(x-y)

化简求值（3x+2y-1)（3x-2y+1）-(x+y)(x-y)