Respuesta :

39x3=30x3+9x3

117=90+27

117=117

39x3=30+9x3

117=30+27

117=57

39x3=300x3+9x3

117=900+27

117=927

39x3=30x3+9

117=90+9

117=99

So the first one is correct.

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hope it helps