
已知x²-5x-2006=0,求代数式(x-2)³-(x-1)²+1/x-2的值
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x^2-5x-2006=0
x^2-5x = 2006
[(x-2)^3-(x-1)^2+1]/(x-2)
=(x-2)^2+[-(x-1)^2+1]/(x-2)
=(x-2)^2+[-x^2+2x-1+1]/(x-2)
=(x^2-4x+4) - x(x-2)/(x-2)
=x^2-4x+4- x
=x^2-5x+4
=2006+4=2010
x^2-5x = 2006
[(x-2)^3-(x-1)^2+1]/(x-2)
=(x-2)^2+[-(x-1)^2+1]/(x-2)
=(x-2)^2+[-x^2+2x-1+1]/(x-2)
=(x^2-4x+4) - x(x-2)/(x-2)
=x^2-4x+4- x
=x^2-5x+4
=2006+4=2010
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