Răspunsuri

2014-11-08T14:46:48+02:00
-2/203*3/305+ 2/203*1/405 + 2/203*3/305 -2/203*1/405=
-2*3/203*305 + 2*3/203*305 + 2/203*405 - 2/ 203*405=0