Răspuns :
1 / 1 × 2 + 1 / 2 × 3 + 1 / 3 × 4 = 2 / 1 + 3 / 2 + 4 / 3 = 12 / 6 + 9 / 6 + 8 / 6 = 21 / 6 + 8 / 6 = 29 / 6
1/1 × 2 + 1/2 × 3 + 1/3 × 4 =
2/1 + 3/2 + 4/3 =
2 + 3/2 + 4/3 = ( 12 + 9 + 8 )/6 = 29/6
1 / 1 × 2 + 1 / 2 × 3 + 1 / 3 × 4 = 2 / 1 + 3 / 2 + 4 / 3 = 12 / 6 + 9 / 6 + 8 / 6 = 21 / 6 + 8 / 6 = 29 / 6
1/1 × 2 + 1/2 × 3 + 1/3 × 4 =
2/1 + 3/2 + 4/3 =
2 + 3/2 + 4/3 = ( 12 + 9 + 8 )/6 = 29/6