Question

Sumas horizontales 3 - 4 + 1 =
- 2 + 0 + 2 =
- 1 + 4 - 3 =
sumas verticales
3 - 2 - 1 =
- 4 + 0 + 4 =
1 + 2 - 3 =
sumas diagonales
3 + 0 - 3 =
1 + 0 - 1 =
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