a3b3−27c3. x3y3z3−8. 8a3b3−27y6. 64x3−y9. 27a3−64c6. x3y3−216z3. 64x3−729y3. 27a3−512c3. 8x6−125y3. 64x12−27y15. 216−8a3. 343−27y3.