La respuesta correcta es un tanto sencilla, sería:
6+3 = 9 x (el segundo número a sumar) 3 = 17
5+7= 12 x (el segundo número a sumar) 7 = 84
3+4= 4 x (el segundo número a sumar) 4 = 28
9+11 = 20 x (el segundo número a sumar) 11 = 220
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