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2017+2×(1+2+3+...........+2016)

Răspuns :

2017+2×(1+2+3+...+2016) =

= 2017+2×2016×2017:2 =

= 2017 + 2016 × 2017 =

= 2017 × (1 + 2016) =

= 2017 × 2017

= 2017^2
2017+2×(1+2+3+...........+2016)=
=2017+2×2016×2017÷2
=2017+2016×2017
=2017 (1+2016)
=2017×2017
=2017^2