(y^3+2)/(y^2-y+1)+(y^3-2)/(y^2+y+1)=2y
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解:(y^3+2)/(y^2-y+1)+(y^3-2)/(y^2+y+1)=2y
(y^3+1+1)/(y^2-y+1)+(y^3-1-1)/(y^2+y+1)=2y
(y+1)+1/(y^2-y+1)+(y-1)-1/(y^2+y+1)=2y
1/(y^2-y+1)-1/(y^2+y+1)=0
y^2-y+1=y^2+y+1
解得y=0
(y^3+1+1)/(y^2-y+1)+(y^3-1-1)/(y^2+y+1)=2y
(y+1)+1/(y^2-y+1)+(y-1)-1/(y^2+y+1)=2y
1/(y^2-y+1)-1/(y^2+y+1)=0
y^2-y+1=y^2+y+1
解得y=0
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