Try to calculate: 1-2-3-4 + 5-6-7-8 + 9-10-11-12 +... + 37-38-39-40

Try to calculate: 1-2-3-4 + 5-6-7-8 + 9-10-11-12 +... + 37-38-39-40

1-2-3-4 + 5-6-7-8 + 9-10-11-12 +... + 37-38-39-40 = (1-2-3-4) + (5-6-7-8) + (9-10-11-12) +... + (37-38-39-40) = - 8-16-24 -... - 80 = - 88 * 10 / 2 = - 440 first group the four numbers to get the arithmetic sequence, then add the sum, just don't look at it first

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