Odpowiedzi

2010-02-07T12:42:07+01:00
25x²-4-(9x²-6x+1)+4x= 25x²-4-9x²+6x-1+4x=16x²+10x-5
2010-02-07T12:42:22+01:00
(5x-2)(5x+2)-(3x-1)²+4x= 25x²+10x-10x-4-3x²+1²= 22x²-3
2010-02-07T12:43:47+01:00
= 25x² + 10x - 10x - 4 - (9x² - 6x + 1) + 4x = 25x² - 4 - 9x² + 6x - 1 + 4x = 16x² + 10x - 5