N种
1 X3-6X2Y+12XY2与-8Y3+1
2 X3-6X2Y+12XY2-8Y3+1与0
3 X3-6X2Y+12XY2-8Y3与1
4 X3-6X2Y+12XY2+1与-8Y3
5 X3-6X2Y+12XY2-7Y3与-Y3+1
.