There are six cards with the number 123456. If you add a negative sign in front of the number of some cards and make the sum of the six cards equal to 1, the formula will be given

Five kinds of negative signs (1,2,3,4), (1,3,6), (1,4,5), (2,3,5), (4,6) were added

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19. There are six cards with 123456. If you put a negative sign in front of the number of some cards to make the sum of these cards 1, list all the formulas There are six cards with 123456. If you put a minus sign in front of the number of some cards to make the sum of these cards 1, list all the formulas
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