Răspunsuri

2014-03-29T17:56:26+02:00
La numarator dam factor comun 3x5x7 si obtinem
3x5x7(2x2+3x3+4x4+......+25x25)
la numitor la fel dam factor comun 2x4x6 si obtinem
2x4x6(2x2+3x3+4x4+.....+25x25)
Observam ca parantezele se simplifica si ne ramane 3x5x7/2x4x6=105/48=35/16