x4-2014x3+2014x2-2014x+2014 = x4 - 2013x3 - x3 + 2013x2 + x2 +2013x + x + 2014
= x4 - 2013 (x3-x2+1) - (x3-x2+1) + 2014
= x4 -2014 (x3-x2+1) + 2014 = x4 - 2014 (x3-x2) = x4 - 2014 x2 (x-1) = x2 ( 20132 - 2014.2012) = x2 [20132 - (2013+1).(2013-1)]
= x2 = 20132
giúp tôi giải bài toán này giùm nhal bạn :/x+1/+/x+2/+/x+3/+...+/x+2013/=2014x