Odpowiedzi

2010-02-14T16:48:50+01:00
A) 7x²-4x-6x²+4-x²+5x = x+4
b) -2(3a-2b)-4a(2-3a+2b) = -6a+4b-8a+12a²-8ab = 12a²-14a-8ab+4b
c) (4-x)(2x+5)-4 = 8x+20-2x²-5x-4 = -2x²+3x+16
d) (4-2x)(3x-3)-2x(3x+1) = 12x-12-6x²+6x-6x²-2x = -12x²+16x-12