Question

2+4+6+8+. +58=

suma lui gaus plssss repede ca is la ora.

Answer 1

Răspuns:

2•(1+2+3+4+.+29)

2• 29 • (29+1) :2

Answer 2

Răspuns:

2 + 4 + 6 + 8 +....................+58 = 870

(2•1) + (2•2)+(2•3)+(2•4)+.......+(2•29)

S = 2 • ( 1 + 2 + 3+ 4 +............+29 )

S = 2• ( 1 + 29 ) • 29 : 2

S = 2• 30 • 29 : 2

S = 60 • 29 : 2

S = 1740 : 2

S = 870