Odpowiedzi

2010-03-10T18:07:29+01:00
(2y-1)²-(2y+3)+3y²+(2y+1)=4y²+1-2y-3+3y²+2y+1=7y²-1
2010-03-10T18:09:43+01:00
(2y-1)²-(2y+3)+3y²+(2y+1)²=4y²-4y+1-2y-3+3y²+4y²+4y+1 =11y²-2y-1