Odpowiedzi

2010-02-08T16:17:57+01:00
A) (-4x+16y-4):4+(2x-y)(2x+y)=
= -x+4y-1+4x²-y²

b) (5x-1)(3x+2)-(2x+1)(3x-2)=
= 15x²+10x-3x-2-6x²+4x-3x+2=
= 9x²+8x

c) 3b (a+b)-(2a+b)(a-b)=
= 3ba+3b²-2a²+2ba-ba+b² =
= 4ba+4b²-2a²

d) (4x+1)(3x-1)+2x(x-3)=
= 12x²-4x+3x-1+2x²-6x=
= 14x²-5x-1