已知:x-2y=2009,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以8x 的值
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2012-08-06
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[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]
=9x^2-4y^2-x^2+4y^2-4x^2-8xy
=4x^2-8xy
=4x(x-2y)
[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以8x
=2009/2
=9x^2-4y^2-x^2+4y^2-4x^2-8xy
=4x^2-8xy
=4x(x-2y)
[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以8x
=2009/2
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