A = 2017 + 2 × ( 1 + 2 + 3 + ...... + 2016 )
A = 2017 + 2 × 2016 × 2017 / 2
A = 2017 + 2016 × 2017
A = 2017 × ( 1 + 2017 )
A = 2017 × 2017
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A : 2017 = ( 2017 × 2017 ) : 2017 = 2017
A = 2017 + 2·(1 + 2 + .. + 2016)
A = 2017 + 2·2016·2017:2
A = 2017 + 2016·2017
A = 2017·(1 + 2016)
A = 2017²
A : 2017 = 2017² : 2017 = 2017²⁻¹ = 2017¹ = 2017