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

1 + 2 - 3 + 4 + 5 - 6 + 7 + 8 - 9 + . 2011 + 2012 - 2013 = ?

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1 + 2 - 3 + 4 + 5 - 6 + 7 + 8 - 9 = (1 + 2 = 3 - 3 = 0) ( 0 + 4 + 5 = 9 - 6 = 3) ( 3 + 7 = 10 + 8 = 18 - 9 = 9) = 9 2011 + 2012 - 2013 = (2011 + 2012 = 4023) (4023 - 2013 = 2010) = 2010 2010 + 9 = 2019.

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Maurybarella
4

1 + 2 - 3 + 4 + 5 - 6 + 7 + 8 - 9 = (1 + 2 = 3 - 3 = 0) ( 0 + 4 + 5 = 9 - 6 = 3) ( 3 + 7 = 10 + 8 = 18 - 9 = 9) = 9

2011 + 2012 - 2013 = (2011 + 2012 = 4023) (4023 - 2013 = 2010) = 2010

2010 + 9 = 2019.