Question

suma a 10 nr naturale impare distincte este 100.aflati nr

Answer 1

un numar natural impar  are forma de :   2x + 1

(2x + 1) + (2x + 3) + (2x + 5) + .... + (2x + 19) = 100

10 × 2x + (1 + 3 + 5 + ..... + 19 )=100

20x +  20 x 10 : 2 = 100

20x + 100 = 100

20x = 0

x=0

2 x 0 + 1 = 1

2 x 0 + 3 = 3

2 x 0 + 5 = 5

...................

2 x 0 + 19 = 19

1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 =100