Boruto: Naruto Next Generations 2017 Tập 64 - Full HD Vietsub - Kamen rider build - YouTube
Đăng kí để nhận nhé !
A = 2 + 22 + 23 + ....+ 2100
=> 2A = 22+23+24+...+2101
=> 2A - A = (22+23+24+....+2101)-(2+22+23+....+2100)
=> A = 2101 - 2
Vậy A = 2101 - 2
\(A=2+2^2+2^3+...+2^{100}\)
\(2A=2\left(2+2^2+2^3+...+2^{100}\right)\)
\(2A=2^2+2^3+2^4+...+2^{101}\)
\(2A-A=\left(2^2+2^3+2^4+...+2^{101}\right)-\left(2+2^2+2^3+...+2^{100}\right)\)
\(A=2^{101}-2\)
Vậy \(A=2^{101}-2\)