Răspunsuri

Cel mai inteligent răspuns!
2014-07-08T16:16:14+03:00
9x 5(1+2+3+....+40):41=

9x 5(1+40)x40/2 :41=

9 x 5 x41x20 :41=

9x5 x20=

45x20= 900-este pp

30²=900


2014-07-08T16:17:54+03:00
5+10+15+...+200
S=40*205:2=4100
9*4100:41=9*100=900- p.p
900=30²