Question

1+ 2+ 3+₁:+48 1+2+3+ut…. 96 2+4+6+8... +66​

Answer 1

Răspuns:

2 + 4 + 6 + 8 +.........+ 66

(2×1)+(2×2)+(2×3)+(2×4)+........(2×33)

2×( 1 + 2 + 3 + 4+..........+33)

S = 2×( 1 +33) ×33 : 2

S = 2×34 × 33 : 2

S = 68 × 33 : 2

S = 2244 : 2

S = 1122

1 + 2 + 3 +............+96

S = ( 1 +96 ) × 96 : 2

S = 97 × 96 : 2

S = 9312 : 2

S = 4656