a: \(A=4+2^2+2^3+...+2^{20}\)

=>\(2A=8+2^3+2^4+...+2^{21}\)

=>\(2A-A=2^{21}+2^{20}+...+2^4+2^3+8-2^{20}-2^{19}-...-2^3-2^2-4\)

\(=2^{21}+8-2^2-4=2^{21}\)

=>\(A=2^{21}\) là lũy thừa của 2

b:

\(B=3+3^2+3^3+...+3^{100}\)

=>\(3B=3^2+3^3+...+3^{101}\)

=>\(2B=3^{101}-3\)

=>\(2B+3=3^{101}\) là lũy thừa của 3

a, \(A=1+2+2^2+2^3+...+2^{100}\)

=> \(2A=2+2^2+2^3+2^4+...+2^{101}\)

=> \(A=2A-A=2^{101}-1\)

=> \(A+1=2^{101}\)

b, \(B=3+3^2+3^3+...+3^{2005}\)

\(3A=3^2+3^3+3^4+....+3^{2006}\)

=> \(2A=3A-A=3^{2006}-3\)

=> \(2A+3=3^{2006}\)là lũy thừa của 3

=> Đpcm

a) Ta có: \(A=1+2+2^2+2^3+.....+2^{100}\)

\(\Rightarrow2A=2+2^2+2^3+........+2^{101}\)

Lấy 2A-A ta có: 

\(2A-A=\left(2+2^2+2^3+2^4+.....+2^{101}\right)\)\(-\left(1+2+2^2+2^3+.......+2^{100}\right)\)

\(\Rightarrow A=2^{101}-1\)

\(\Rightarrow A+1=2^{101}-1+1\)

\(\Rightarrow A+1=2^{101}\)

b) Ta có: \(B=3+3^2+3^3+.....+3^{2005}\)

\(\Rightarrow3B=3^2+3^3+3^4+.....+3^{2006}\)

\(\Rightarrow3B-B=\left(3^2+3^3+3^4+....+3^{2006}\right)\)\(-\left(3+3^2+3^3+......+3^{2005}\right)\)

\(\Rightarrow2B=3^{2006}-3\)

\(\Rightarrow2B+3=3^{2006}-3+3\)

\(\Rightarrow2B+3=3^{2006}\)

Vậy 2B+3 là lũy thừa của 3         ĐPCM

9+8^2+8^3+...8^50

a: Tổng các số hạng là:

\(\dfrac{\left(220+1\right)\cdot220}{2}=24310\)

Ta có: A+1=2x

\(\Leftrightarrow2x=24311\)

hay \(x=\dfrac{24311}{2}\)

Câu 3:

\(A=3+3^2+...+3^{100}\)

\(3A=3^2+3^3+...+3^{101}\)

\(3A-A=3^2+3^3+...+3^{101}-\left(3+3^2+...+3^{100}\right)\)

\(2A=3^{101}-3\) 

Mà: \(2A+3=3^N\)

\(\Rightarrow3^{101}-3+3=3^N\)

\(\Rightarrow3^{101}=3^N\)

\(\Rightarrow N=101\)

Vậy: ... 

Câu 1:

\(A=4+2^2+...+2^{20}\)

Đặt \(B=2^2+2^3+...+2^{20}\)

=>\(2B=2^3+2^4+...+2^{21}\)

=>\(2B-B=2^3+2^4+...+2^{21}-2^2-2^3-...-2^{20}\)

=>\(B=2^{21}-4\)

=>\(A=B+4=2^{21}-4+4=2^{21}\) là lũy thừa của 2

Câu 6:

Đặt A=1+2+3+...+n

Số số hạng là \(\dfrac{n-1}{1}+1=n-1+1=n\left(số\right)\)

=>\(A=\dfrac{n\left(n+1\right)}{2}\)

=>\(A⋮n+1\)

Câu 5:

\(A=5+5^2+...+5^8\)

\(=\left(5+5^2\right)+\left(5^3+5^4\right)+\left(5^5+5^6\right)+\left(5^7+5^8\right)\)

\(=\left(5+5^2\right)+5^2\left(5+5^2\right)+5^4\left(5+5^2\right)+5^6\left(5+5^2\right)\)

\(=30\left(1+5^2+5^4+5^6\right)⋮30\)

Bây giờ cậu cần không thế;D

1,

\(A=2^0+2^1+2^2+..+2^{2006}\)

\(=1+2+2^2+...+2^{2016}\)

\(2A=2+2^2+2^3+..+2^{2007}\)

\(2A-A=\left(2+2^2+2^3+..+2^{2007}\right)-\left(1+2+2^2+..+2^{2006}\right)\)

           \(A=2^{2017}-1\)

\(B=1+3+3^2+..+3^{100}\)

\(3B=3+3^2+3^3+..+3^{101}\)

\(3B-B=\left(3+3^2+..+3^{101}\right)-\left(1+3+..+3^{100}\right)\)

\(2B=3^{101}-1\)

\(\Rightarrow B=\frac{3^{100}-1}{2}\)

\(D=1+5+5^2+...+5^{2000}\)

\(5D=5+5^2+5^3+...+5^{2001}\)

\(5D-D=\left(5+5^2+..+5^{2001}\right)-\left(1+5+...+5^{2000}\right)\)

\(4D=5^{2001}-1\)

\(D=\frac{5^{2001}-1}{4}\)

các bn giúp mk nha càng nhanh càng tốt

ai nhanh mk TC cho

a) \(2^0+2^1+2^2+...+2^{2006}\)

= \(1+2+2^2+...+2^{2006}\)

Nhân A = 2 cho hai vế:

\(2A=2+2^2+2^3+...+2^{2007}\)

=> \(2A-A=\left(2+2^2+2^3+...+2^{2007}\right)-\left(1+2+2^2+2^{2006}\right)\)

=> \(A=2^{2007}-1\)

Ta có A = 2A – A = 2( 1 + 2 + 2 2 + 2 3 + . . . + 2 50 ) – ( 1 + 2 + 2 2 + 2 3 + . . . + 2 50 )

=  2 + 4 + 2 3 + 2 4 + . . . + 2 51  – ( 1 + 2 + 2 2 + 2 3 + . . . + 2 50 )

= 6 + 2 3 + 2 4 + . . . + 2 51  – ( 7 + 2 3 + . . . + 2 50 ) =  2 51 - 1

Suy ra : A + 1 =  2 51

Vậy A+1 là một lũy thừa của 2