来自李国正的问题
【已知实数x满足4x2-4x+1=0,则代数式2x+12x的值为()A.2B.-2C.1D.-1】
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
1回答
2020-02-01 00:42
【已知实数x满足4x2-4x+1=0,则代数式2x+12x的值为()A.2B.-2C.1D.-1】
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
∵实数x满足4x2-4x+1=0,
∴(2x-1)2=0,解得x=12