Question

tim 1 so co 2 chu so biet so do chia tong cac chu so cua no bang tong cac chu so cac chu so

 

 

Answer 1

81 nhé bạn

Answer 2

81 :(1+8) = 9

(:(:(:

Answer 3

81:(8+1)=9

=>so co 2 chu so=81