Question

Найдите сумму 1-2-3+4-5-6+7-.....2018

Answer 1

Ответ 1-2-3+4-5-6+7-.....2018 = -1009

Answer 2

Calculation of the Sum 1-2-3+4-5-6+7-.....2018

To find the sum of the series 1-2-3+4-5-6+7-.....2018, we can group the numbers in pairs and observe a pattern.

The series can be rearranged as follows: (1-2) + (3-4) + (5-6) + (7-8) + ... + (2017-2018)

Each pair in the series has a sum of -1. So, the sum of the series can be calculated by finding the number of pairs and multiplying it by -1.

To find the number of pairs, we can divide the last number in the series (2018) by 2 and round down to the nearest whole number. This gives us 1009 pairs.

Therefore, the sum of the series 1-2-3+4-5-6+7-.....2018 is -1009.

Please note that the sources provided do not directly answer the question. The calculation is based on the mathematical pattern observed in the series.