Question

Calculate
1-2+3 - 4+5 - 6 +7 - 8 + 9 - 10​

Answer 1

1-2+3 - 4+5 - 6 +7 - 8 + 9 - 10

= - 5.

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Answer 2

$(1 - 2) + (3 - 4) + (5 - 6) + (7 - 8) + (9 - 10) \\ ( - 1) + ( - 1) + ( - 1) + ( - 1) + ( - 1) \\ ( - 5)$

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