1.已知:x-2y=3,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除4x 的值

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2y=x-3带入[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]/4x =[(3x+x-3)(3X-x+3)-(x+x-3)(5x+3-x)]/4x=(8x2-6x=12x-9-8x2=12x-6x=9)/4x=12x/4x=3

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