Odpowiedzi

2009-12-08T17:09:39+01:00
(x +1)(x-2)+(x+2)(x-1)=x²-2x+x-2+x²-x+2x-2=2x²-4

(5k+n)(k-2n)-k(4k+n)=5k²-10kn+kn-2n²-4k²-kn=k²-2n²-10kn

(4y+3)(y-2)-2y(4-2y)=4y²-8y+3y-6-8y-4y²=-13y-6
2 5 2
2009-12-08T17:12:19+01:00
(x +1)(x-2)+(x+2)(x-1)= x²-2x+x-2+x²-x+2x-2=2x²-4
(5k+n)(k-2n)-k(4k+n)=5k²-10kn+kn-2n²-4k²-kn=k²-9kn-2n²
(4y+3)(y-2)-2y(4-2y)=4y²-8y+3y-6-8y-4y²=-13y-6
1 5 1