问题
填空题
已知x=2-
|
答案
由x=2-
得x-2=-5
,5
两边平方,得x2-4x+4=5
∴x2-4x-1=0
∴x4-8x3+16x2-x+1=(x2-4x-1)(x2-4x+1)+(-x+2)
=2-x
=
.5
已知x=2-
|
由x=2-
得x-2=-5
,5
两边平方,得x2-4x+4=5
∴x2-4x-1=0
∴x4-8x3+16x2-x+1=(x2-4x-1)(x2-4x+1)+(-x+2)
=2-x
=
.5