设根为t,可以判断t,t^2,t^3,均为无理数 t^3-3t+10=0 a=(t^2+t-2)/2
a^2=(t^4+t^2+4+2t^3-4t^2-4t)/2=(t^4-3t^2+2t^3-4t+4/2=(-10t+2t^3-4t+4)/2=2+t^3-7t=-4t-8
h(a)=m(-4t-8)+c=t h(0)=-2