6 (x-2)(x+2)-(x-2)(x+2)-(x-1)(x+3)-(x+2)还有（2x+3y-2)(2x-3y+2)
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6 (x-2)(x+2)-(x-2)(x+2)-(x-1)(x+3)-(x+2)
=5(x²-4)-(x²+2x-3)-(x+2)
=5x²-20-x²-2x+3-x-2
=4x²-3x-19
还有（2x+3y-2)(2x-3y+2)
=[2x+(3y-2)][2x-(3y-2)]
=4x²-(3y-2)²
=4x²-9y²+12y-4
=5(x²-4)-(x²+2x-3)-(x+2)
=5x²-20-x²-2x+3-x-2
=4x²-3x-19
还有（2x+3y-2)(2x-3y+2)
=[2x+(3y-2)][2x-(3y-2)]
=4x²-(3y-2)²
=4x²-9y²+12y-4
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