若x-2y=2,求x^2-4y^2-8y的值.
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若x-2y=2,求x^2-4y^2-8y的值.
若x-2y=2,求x^2-4y^2-8y的值.
若x-2y=2,求x^2-4y^2-8y的值.
x^2-4y^2-8y=(x-2y)*(x+2y)-8y=2x+4y-8y=2x-4y=0
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