Odpowiedzi

2009-12-10T19:12:41+01:00
(5k+n)(k-2n)-k(4k+n)= 5k²-10kn+kn-2n²-4k²-kn= k²-2n²-10kn
2009-12-10T19:12:54+01:00
(5k+n)(k-2n)-k(4k+n)=5k²-10kn+kn-2n²-4k²-kn=k²-10kn-2n²
2009-12-10T19:12:56+01:00