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Aratati ca nr 2018 la a doua minus 2018 minus2017 este p p

Răspuns :

2018^2 - 2018 - 2017 =

2018 × 2018 - 2018 - 2017 =

2018 × (2018 - 1) - 2017 =

2018 × 2017 - 2017 =

2017 × (2018 - 1) =

2017 × 2017 =

2017^2 p.p