Mai Quốc Bình Hg
30/07/2017 at 14:55-
We got :
x = 9
=> x + 1 = 10
We have :
A = x2016 - 10.x2015 + 10.x2014 - 10.x2013 + ........ + 10x2 - 10x + 2026
A = x2016 - (x + 1).x2015 + (x + 1).x2014 - (x + 1).x2013 + ........ + (x + 1).x2 - (x + 1)x + 2026
A = x2016 - x2016 - x2015 + x2015 + x2014 - x2014 - x2013 + ......... + x3 + x2 - x2 - x + 2026
A = -x + 2016
A = -9 + 2026
A = 2017
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