(3x+2)(3x-2)-5x(x-1)-(x-1)(4x-2)其中x=1
(3x+2)(3x-2)-5x(x-1)-(x-1)(4x-2)
=9x²-4-5x²+5x-4x²+6x-2
=11x-6
=11×1-6
=5