a = (2+4+6+8+...4028+4030)(2014*2015 - 2015*2016)
am sa separ cele 2 paranteze sa intelegi mai bine
2+4+6+8+...4028+4030 = 2(1+2+3+4+...+2014+2015) = 2*(2015*2016)/2 = 2015*2016
2014*2015 - 2015*2016 = 2015(2014-2016) = 2015*(-2)
a = 2015*2016*2015*(-2) = 2015^2*2016*(-2)
sigur ai scris bine intrebarea?
