a^2-3a+(3/2)^2=9/4-1
(a-3/2)^2=5/4
a-3/2=土5/4
a1=11/4
a2=1/4
则:1.=(11/4)^4+1=14641/256+1=14897/256
2.=(1/4)^4+1=257/256