Odpowiedzi

2010-04-14T17:00:01+02:00
A) 7x2-4x-6x2+4-x2+5x= 14x-4x-12x+4-2x+5x= x+4

b) -2(3a-2b)-4a(2-3a+2b)= -6a+4b-8a+14a²-8ab = 14a²-8ab-14a+4b


c) (4-x)(2x+5)-4= 8x-20-2x²-5x-4= -2x+3x-24


d) (4-2x)(3x-3)-2x(3x+1)= 12x-12-6x²+6x-6x²-2x= -12x²+16x-12