Respuesta :

1) 7 x 9 = 7 (3 +6) = 7 x 3 + 7 x 6

2) 7 x 9 = (4 + 3) x 9 = 4 x 9 + 3 x 9

3) 7 x 9 = (6 + 1) x (5 +4) = 6 x 5 + 6 x 4 + 1 x 5 + 1 x 4

There are many more.