a^2 b+ab^2= ab (a-b)
ab = 1/2 *1/2 ((g2016^2)- (g2014)^2)= 1/4(2016-2014)=1/2
a-b=1/2 ( 2* g2014 )=g 2014
两式相乘,答案= g（2014）/2