Toán A = 2 + 2^2 + 2^3 + 2^4 + …. + 2^100 02/07/2021 By Gabriella A = 2 + 2^2 + 2^3 + 2^4 + …. + 2^100
$A=2+2^2+2^3+…+2^{100}$ $2A=2^2+2^3+2^4+…+2^{101}$ $2A-A=(2^2+2^3+…+2^{101})-(2+2^2+2^3+…+2^{100})$ $\to A=2^{101}-2$ Trả lời
Đáp án: A=2+22+23+...+2100A=2+22+23+…+2100 =>2A=22+23+24+...+21012A=22+23+24+…+2101 =>2A−A=(22+23+...+2101)−(2+22+23+...+2100)2A−A=(22+23+…+2101)−(2+22+23+…+2100) ->A=2101−2 Trả lời
$A=2+2^2+2^3+…+2^{100}$
$2A=2^2+2^3+2^4+…+2^{101}$
$2A-A=(2^2+2^3+…+2^{101})-(2+2^2+2^3+…+2^{100})$
$\to A=2^{101}-2$
Đáp án:
A=2+22+23+...+2100A=2+22+23+…+2100
=>2A=22+23+24+...+21012A=22+23+24+…+2101
=>2A−A=(22+23+...+2101)−(2+22+23+...+2100)2A−A=(22+23+…+2101)−(2+22+23+…+2100)
->A=2101−2