因为aˆ2/（aˆ4+aˆ2+1）=1/24,（aˆ4+aˆ2+1）/a^2=24,a^2+2+(1/a)^2=25,(a+1/a)^2=25a+1/a=5bˆ3/(bˆ6+bˆ3+1)=1/19,b^3+1+(1/b)^3=19,(b+1/b)(b^2-1+1/b^2)=18,(b+1/b)((b+1/b...b+1/b=3,这个式子是怎么来的设b+1/b=x，x^3-3x=18 x=3