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歡迎您訪問數學考題練習:已知m是方程x2-2006x+1=0的一個根,!

數學考題練習:已知m是方程x2-2006x+1=0的一個根,

更新時間:2024-01-12 14:02:11作者:貝語網校

已知m是方程x2-2006x+1=0的一個根,則代數的值等于

A.2005

B.2006

C.2007

D.2008

試題答案

D

試題解析

由題意有:m2-2006m+1=0得,m2=2006m-1,m2+1=2006m代入代數式化簡求值.

解答:∵m是方程x2-2006x+1=0的一個根,

∴m2=2006m-1 ①

m2+1=2006m ②

把①,②代入上式有:

原式=2006m-1-2005m++3,

=m++2,

=+2,

=+2,

=2006+2,

=2008.

故選D.

點評:本題考查的是一元二次方程的解,把方程的解代入方程得到關于m的式子,代入代數式化簡求值.

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