问题 填空题
若a2-3a+1=0,则3a3-8a2+a+
3
a2+1
=______.
答案

∵a2-3a+1=0,

∴a2=3a-1,a2+1=3a,

∴3a3-8a2+a+

3
a2+1
,3a-a2=1,

=3a3-8a2+a+

3
3a

=3a3-8a2+a+

1
a

=3a3-8a2+a+

3a-a 2
a

=3a3-8a2+3,

=3a(3a-1)-8a2+3,

=a2-3a+1+2,

=0+2,

=2.

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