Odpowiedzi

2010-03-02T18:57:18+01:00
( x + 3y)(x-2y)+(x+y)² = x2-2xy+3xy-6y2+ x2+y2= x4+xy-5y2
2010-03-02T19:12:49+01:00
(x2+3y)(x-2y)+(x+y)=(x2-2xy+3xy-6y2)+(x2+2xy+y2)=2x2+xy-5y2