Question

1-2+3-4+5-6+......+99-100как решить

Answer 1

Ответ:

-2

Пошаговое объяснение:

В

Answer 2

To find the sum of the series 1-2+3-4+5-6+...+99-100, you can use a simple mathematical formula for the sum of an arithmetic series.

The series given is an arithmetic series with a common difference of -1. The first term is 1, and the last term is -100. The formula to find the sum of an arithmetic series is:

Sum = (n/2) * (first term + last term)

Where: n = number of terms first term = the first term of the series last term = the last term of the series

In this case, n is the number of terms in the series, and it's equal to 100 since there are 100 terms in the sequence (1 to 100). The first term (a) is 1, and the last term (l) is -100.

Now, plug these values into the formula:

Sum = (100/2) * (1 - 100)

Calculate the values in parentheses first:

Sum = 50 * (-99)

Finally, calculate the sum:

Sum = -4950

The sum of the series 1-2+3-4+5-6+...+99-100 is -4950.