👤

4+8+12+...+396=200x aflati nr x

Răspuns :

4= 4·1 
................
396 = 4 · 99 
( 4 + 396) · 99 / 2 = 200x 
400 · 99 :2 = 200x 
99 · 400 :2 = 200x 
99 · 200 = 200x 
x = 99