Question

cho mik hỏi A=3^1+3^2+3^3+...+3^10. chứng minh A:3

Answer 1

\(A=3\left(1+3+3^2+3^3+...+3^9\right)⋮3\)

Answer 2

A=3(1+3+32+33+...+39)⋮3

Answer 3

A=3(1+3+32+33+...+39)⋮3