Lời giải:
1. x ³ - ( y-1) ³
= ( x - y +1 ) . ( x² + x. ( y-1 ) + ( y-1)² )
2. x^6 + 1
= ( x² )³ + 1³
= ( x² +1 ) . ( x^4 + x² + 1 )
3. x^6 + y^6
= ( x² )³ - ( y² )³
= ( x-y ) . ( x^4 + x²y² + y^4 )
4. x ^9 + 1
= ( x ³ )³ + 1³
= ( x³ +1 ). ( x^6 - x³ + 1 )
5. x³ + 6x² + 12x + 8
= x³ + 3.2.x² + 3.2²x + 2³
= ( x + 2 )³
cho minh xin ctlhn nhoa>3000