Răspuns :
=2 ¹⁺² ⁺³⁺ ...... ⁺ ²⁵ = 2³⁰⁰
1+2+ ..... + 25 = ( 1 +25 ) · 25 /2 = 26·25 /2 = 13 ·25 =300
1+2+ ..... + 25 = ( 1 +25 ) · 25 /2 = 26·25 /2 = 13 ·25 =300
[tex] 2^{1+2+3} [/tex] + [tex] 2^{5} [/tex]
= ( 1+25)*25/2
=25*26/2
=25*13
=300