Question

2+4+6+........+1000-1-3-5-.......-999

Answer 1

Sper ca te am ajutat !!!

Answer 2

2 + 4 + 6 + ............+ 1 000 - ( scad)

1 + 3 + 5 + .............+ 999

___________________

= ( 2- 1 ) + ( 4 - 3 ) + ( 6 - 5 ) + ...........+ ( 1 000 - 999 ) =

→ stabilim cate diferente sunt: 1 000 : 2 = 500 de diferente

= 500 × 1 = 500

sau :

2 + 4 + 6 + .....+ 1 000 =2 ( 1 + 2 + 3 + ....+ 500) = 2 × 500 × 501 / 2 = 250500 ( -)

1 + 3 + 5 + .....+ 999 = 500 × 1 000 / 2= 500 × 500 = 250 000

__________________________________________________

250 500 - 250 000 = 500