Odpowiedzi

2009-11-21T18:59:14+01:00
2009-11-21T19:06:24+01:00
2009-11-22T00:50:27+01:00
1/2 - 2/3 +7/6 = 3/6 - 4/6 + 7/6= -1/6 + 7/6 = 6/6 = 1