👤
a fost răspuns

2×(1+2+3+...+2018)+2019=pp
va rog sa imi explicati,multumesc

Răspuns :

Cocirmariadenis

2 × ( 1 + 2 + 3 + ..... + 2018 ) + 2019 =  2019²

= 2 × 2018 × ( 1 + 2018 ) : 2 + 2019 =

= 2018 × 2019 + 2019 =

= 2019 × ( 2018 + 1 ) =

= 2019 × 2019 =

= 2019² → patrat perfect

Alte intrebari