Question

[P Vu]

b=6+6^2+6^3+...6^58+6^59 tính tổng

Answer 1

[Dang Tung]

B = 6 + 6^2 + 6^3 + ... +6^58+ 6^59

=> 6B = 6^2 + 6^3 + 6^4 + .... + 6^59 + 6^60

=> 6B - B = 6^60 - 6

=> 5B = 6^60 - 6

=> B = (6^60 - 6)/5