Respuesta:
a) 81
Explicación paso a paso:
7×9 = 63➡️6+3 =9➡️9×1
77×99=7623➡️7+6+2+3=18➡️9×2
777×999=776223➡️7+7+6+2+2+3=27➡️9×3
.
A = 777777777x999999999
A Suma de cifras es
9×9= 81
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Respuesta:
a) 81
Explicación paso a paso:
7×9 = 63➡️6+3 =9➡️9×1
77×99=7623➡️7+6+2+3=18➡️9×2
777×999=776223➡️7+7+6+2+2+3=27➡️9×3
.
.
A = 777777777x999999999
A Suma de cifras es
9×9= 81