已知实数x满足4x2-4x+1=0,则代数式2x+12x的值为(  ) A.2 B.-2 C.1 D.-1

问题描述:

已知实数x满足4x2-4x+1=0,则代数式2x+

1
2x
的值为(  )
A. 2
B. -2
C. 1
D. -1

∵实数x满足4x2-4x+1=0,
∴(2x-1)2=0,解得x=

1
2

∴原式=2×
1
2
+
1
1
2
=1+1=2.
故选A.