> 数学 >
已知x2-5x-2000=0,则代数式
(x−2)3(x−1)2+1
x−2
的值为______.
人气:140 ℃ 时间:2019-10-19 20:56:58
解答
∵x2-5x-2000=0,
∴x2-5x=2000.
又∵(x-2)3-(x-1)2+1
=(x-2)3-[(x-1)2-1]
=(x-2)3-[(x-1+1)(x-1-1)]
=(x-2)3-x(x-2)
=(x-2)[(x-2)2-x]
=(x-2)(x2-5x+4),
(x−2)3(x−1)2+1
x−2
=
(x−2)(x2−5x+4)
x−2
=x2-5x+4=2000+4=2004.
故答案为:2004.
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