Odpowiedzi

2010-01-25T14:43:20+01:00
A) 7x²-4x-6x²+4-5x=7x²-6x²-4x-5x+4= x²-9x+4
b) -2(3a-2b)-4a(2-3a+2b)= -6a+4b-8a+12a²-8ab=-14a+4b+12a²-8ab
c) (4-x)(2x+5)-4=8x+20-2x²-5x=3x+20-2x²
d) (4-2x)(3x-3)-2x(3x+1)=12x-12-6x²+6x-6x²-2x=16x-12-12x²
2010-01-25T14:46:21+01:00
A)=49x-4x-36x+4-5x=4x+4
b)=-6a+4b-8a+12a-8ab=36a+4b-8ab
c)=8x+20-2x2-5x-4=8x+20-4x-5x-4=-1x-16