y+3=1/yy-1/y=-3y^2+1/y^2-2=9y^2+1/y^2=11y^4+1/y^4+2=121y^4+1/y^4=119y^4/(y^8-3y^4+1)=1/(y^4+1/y^4-3)=1/116
就是这我是许红一