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tverrrrproduct
@tverrrrproduct
August 2022
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Вычислите без калькулятора: 1 + 2 – 3 – 4 + 5 + 6 – 7 – 8 + … –2016 + 2017.
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Удачник66
Verified answer
Сгруппируем так
(1-3) + (2-4) + (5-7) + (6-8) + ... + (2013-2015) + (2014-2016) + 2017 =
= (-2) + (-2) + ... + (-2) + (-2) + 2017 = -2*2016/2 + 2017 = -2016 + 2017 = 1
3 votes
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Verified answer
Сгруппируем так(1-3) + (2-4) + (5-7) + (6-8) + ... + (2013-2015) + (2014-2016) + 2017 =
= (-2) + (-2) + ... + (-2) + (-2) + 2017 = -2*2016/2 + 2017 = -2016 + 2017 = 1