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*1
*-6
*4
*-11
*4
*-6
*-15
*-11
*-2
(+) + (+) = + Se suman
(+ ) + (-) = - Se restan
(-) + (+) = - Se restan
(-) + (-) = - Se suman
Resultados:
4 - 8 = -4
6-5 = 1
-5-1 = - 6
2-6 = - 4
-7-4 = - 11
9-5 = 4
3-9 = - 6
-8-7 = - 15
-9-2 = - 11
-1-1 = - 2
Saludos