x2-11x+1=0,求x2+1/x2的值.
问题描述:
x2-11x+1=0,求x2+
的值. 1 x2
答
∵x≠0,
∴x+
=11,1 x
(x+
)2=121,1 x
∴x2+2+
=121,1 x2
∴x2+
=119.1 x2