1 / 1x2x3 + 1 / 2x3x4 + 1 / 3x4 x5 + 1 / 4x5x6 +.. + 1 / 8 x9 x 10 은 얼마 입 니까?

1 / 1x2x3 + 1 / 2x3x4 + 1 / 3x4 x5 + 1 / 4x5x6 +.. + 1 / 8 x9 x 10 은 얼마 입 니까?

1 / 1x2x2x x 3 + 1 / 2x3 x4 + 1 / 3x4 x5 + 1 / 4 x5x6 +.. + 1 / 8 x9 x x 10 = 1 / 1 / 1 / 2 (1 / 1 / 3) + 1 / 2 / 1 / 1 / 3 / 3 3 3 3 / 3 3 3 3 x 4 4 x x x x x x x x x x x x x x x 3 x x x x 3 x x x 3 + 1 / 4 / 1 / 1 / 1 / 1 / 1 / 1 / 2 (1 / 1 / 4 / 1 / 1 / 1 / 6) + + 1 / 1 / 1 / 1 / 1 / 1 / 6 + + 1 / 1 / 1 / 1 / 1 / 1 / 1 / 1 / 1 / 1 / 1 / 1 / 1 / 1 / 1 / 1 / 1 / 1 / 1 / 1 / 1 / 360