Răspuns :
17 + 17 x 2 + ... + 17 x 17=
=17(1+2+3+...+17)=
=17 x (17 x 18)/2= 17 x 17 x 9 = 17^2 x 3^2 = 51^2 -patrat perfect
=17(1+2+3+...+17)=
=17 x (17 x 18)/2= 17 x 17 x 9 = 17^2 x 3^2 = 51^2 -patrat perfect
17 + 17 x 2 + ... + 17 x 17=
=17(1+2+3+...+17)=
=17 x (17 x 18)/2= 17 x 17 x 9 = 17^2 x 3^2 = 51^2 sper ca team ajutat