¿Quieres miles de fichas gratuitas (y cero distracciones)? Here’s how
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+9 = -1 +10 +8 = -2 +10 +7 = -3 +10 +6 = -4 +10 +5 = -5 +10 +4 = -6 +10 +3 = -7 +10 +2 = -8 +10 +1 = -9 +10
+1 = -9 +10
-8 = -10 +2
-5 = -10 +5
-4 = -10 +6
Abacus direct sums, +5 complements and -5 complements sums
Complement of an event