Question

Explain me
answer is written
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Answer 1

1 - 2 + 3 - 4 + 5 - 6 + 7 - 8 + 9 - 10 + 11 - 12 + 13 - 14 + 15 - 16 + 17 - 18 + 19 - 20

Now add the brackets:

(1 - 2) + (3 - 4) + (5 - 6) + (7 - 8) + (9 - 10) + (11 - 12) + (13 - 14) + (15 - 16) + (17 - 18) + (19 - 20)

If you are confused about the brackets then look at this example:

-> 1 - 2 + 3 - 4 -> 1 - 2 + 3 - 4

-> (1 - 2) + (3 - 4) -> 1 (-2 + 3) - 4

-> ( -1) + ( -1 ) -> 1 (+ 1 ) - 4

-> - 2 -> 1 + 1 - 4

-> 2 - 4 -> - 2

After solving the brackets:

(-1) + (-1) ... = -10

- 1 + (-1) = -1 -1 = -2 ( - and - = add the digits with a minus sign)

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