Odpowiedzi

2010-01-16T17:32:55+01:00
A) 7xkwadrat-4x-6xkwadrat-xkwadrat+5x=x
b)-2(3a-2b)-4a(2-3a+2b)=-6a+4b-8a+12a²-8ab=12a²-2a+4b-8a
c)(4-x)(2x+5)-4=8x+20-2x²-5x=-2x+3x+20
d)(4-2x)(3x-3)-2x(3x+1)=12x-12-6x²+6x-6x²-2x=-12x²+16x-12

2010-01-16T17:35:35+01:00
7xkwadrat-4x-6xkwadrat-xkwadrat+5x=7x^2-4x-6x^2-x^2+5x=x

-2(3a-2b)-4a(2-3a+2b)=-6a+4b-8a+12a^2-8ab=-14a+12a^2+4b-8ab=-2a(8-6a)+4b(1-2a)

(4-x)(2x+5)-4=8x+20-x^2-5x-4=-x^2+3x+16

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