问题
解答题
已知x2-5x-2014=0,求代数式
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答案
∵x2-5x-2014=0,
∴x2-5x=2014,
∴原式=
×(x-2)3-(x-1)2+1 (x-2)2
=2x(x-2) 2x (x-2)3-(x-1)2+1 x-2
=(x-2)2-
+(x-1)2 x-2 1 x-2
=(x-2)2-(x-1)2-1 x-2
=(x-2)2-x(x-2) x-2
=(x-2)2-x
=x2-5x+4
=2014+4
=2018;