1-2-3+4+5-6-7+8+9-10…… +What is the formula of 2008?

0 ah! With four terms as the unit, everything after ~ 1-2-3 + 4 = 0 is equal to 0, so 1-2-3 + 4 + 5-6-7 + 8 + 9-10 +2008=0

The formula is 1 * 2 + 2 * 3 + 3 * 4 +. + 8 * 9 + 9 * 10, please

1 * 2 / 1 + 2 * 3 / 1 + 3 * 4 / 1 +. + 8 * 9 / 1 + 9 * 10 / 1 = 1 / (1x2) + 1 / (2x3) + 1 / (3x4) +... + 1 / (8x9) + 1 / (9x10) = (1 / 1 - 1 / 2) + (1 / 2 - 1 / 3) + (1 / 3 - 1 / 4) +... + (1 / 8-1 / 9) + (1 / 9-1 / 10) = 1 / 1 - 1 / 10 = 9 / 10

Simple formula of (1-1 / 2-1 / 4 × 1 / 2) △ 5 / 8

（1-1/2-1/4×1/2）÷5/8
=（1/2-1/8）*8/5
=（4/8-1/8）*8/5
=3/8*8/5
=3/5

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