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 Restar números enteros Una resta de números enteros se puede resolver como si se tratara de una suma, pero con una particularidad: El símbolo de la resta le cambia el signo a la cifra que le sigue, por lo que: Si el número que se resta es positivo lo convierte en negativo. Si el número que se resta es negativo lo convierte en positivo. Calcula: a) (-9) - (+5) = (-9) + (-5) = -9 - 5 = -14 b) (+12) - (-8) = (+12) + (+8) = 12 +8 = 20 c) (-19) - (+7) - (-6) = (-19) + (-7) + (+6) = -19 -7 +6 = -26 +6 = -20 Calcula: (+18)-(-18)-(-1)-(+3) =