Respuesta:
+9-3-2-1
+6-2-1
+4-1
+3
regla de multiplicacion de signos
+x+=+
-x- = +
+x-=-
-x+=+
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Respuesta:
+9-3-2-1
+6-2-1
+4-1
+3
regla de multiplicacion de signos
+x+=+
-x- = +
+x-=-
-x+=+