Ta có: (x+1)+(x+2)+...+(x+2013)=2013.2014
<=>2013x+2027091=4054182
<=>2013x=2029091
<=>x=1007
(x+1) + (x+2) + ..........+ (x+2013) = 4054182
x+1 + x+2 + ..........+ x+2013 = 4054182
(x+x+x+x+..........+x) + (1+2+3+4+..........+2013) = 4054182
2013x + (1+2013) . 2013 : 2 = 4054182
2013x + 2027091 = 4054182
2013x = 4054182 - 2027091
2013x = 2027091
x = 2027091 : 2013
x = 1007