问题
解答题
当x=
|
答案
∵x=
=1 2- 3
=2+2+ 3 (2-
)(2+3
)3 3
∴当x=2+
时,3
x2-4x+2=x2-4x+4-2
=(x-2)2-2,
=(2+
-2)2-23
=3-2=1.
当x=
|
∵x=
=1 2- 3
=2+2+ 3 (2-
)(2+3
)3 3
∴当x=2+
时,3
x2-4x+2=x2-4x+4-2
=(x-2)2-2,
=(2+
-2)2-23
=3-2=1.