问题
填空题
已知a2-3a+1=0,则a+
|
答案
∵a2-3a+1=0,
∴a2+1=3a,
∴a+
=1 a
=a 2+1 a
=3,3a a
∵a2-3a+1=0,
∴a2+1=3a,
∴(a2+1)2=9a2,
∴a4+1=7a2,
∵a2+
=1 a2
=a 4+1 a 2
=77a 2 a 2
故答案为3,7.
已知a2-3a+1=0,则a+
|
∵a2-3a+1=0,
∴a2+1=3a,
∴a+
=1 a
=a 2+1 a
=3,3a a
∵a2-3a+1=0,
∴a2+1=3a,
∴(a2+1)2=9a2,
∴a4+1=7a2,
∵a2+
=1 a2
=a 4+1 a 2
=77a 2 a 2
故答案为3,7.