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\(P=\left(1+2\right)+2^2\left(1+2\right)+...+2^{2020}\left(1+2\right)\)
\(=3\left(1+2^2+...+2^{2020}\right)⋮3\)
\(P=\left(1+2\right)+2^2\left(1+2\right)+...+2^{2020}\left(1+2\right)\\ P=\left(1+2\right)\left(1+2^2+...+2^{2020}\right)=3\left(1+2^2+...+2^{2020}\right)⋮3\)
Lời giải:
\(S=2+(2^2+2^3+2^4)+(2^5+2^6+2^7)+...+(2^{2018}+2^{2019}+2^{2020})\)
\(=2+2(1+2+2^2)+2^5(1+2+2^2)+....+2^{2018}(1+2+2^2)\)
\(=2+(1+2+2^2)(2+2^5+...+2^{2018})=2+7(2+2^5+...+2^{2018})\)
Vậy $S$ chia $7$ dư $2$
\(A=1+2+2^2+...+2^{2018}\)
\(2A=2+2^3+2^4+...+2^{2019}\)
\(A=2A-A=1-2^{2019}\)
\(B-A=2^{2019}-\left(1-2^{2019}\right)\)
\(B-A=2^{2019}-1+2^{2019}\)
\(B-A=1\)
`#3107`
\(A=1+2+2^2+2^3+...+2^{2018}\) và \(B=2^{2019}\)
Ta có:
\(A=1+2+2^2+2^3+...+2^{2018}\)
\(2A=2+2^2+2^3+...+2^{2019}\)
\(2A-A=\left(2+2^2+2^3+...+2^{2019}\right)-\left(1+2+2^2+2^3+...+2^{2018}\right)\)
\(A=2+2^2+2^3+...+2^{2019}-1-2-2^2-2^3-...-2^{2018}\)
\(A=2^{2019}-1\)
Vậy, \(A=2^{2019}-1\)
Ta có:
\(B-A=2^{2019}-2^{2019}+1=1\)
Vậy, `B - A = 1.`
\(A=2+2^2+2^3+...+2^{2020}+2^{2021}+2^{2022}\\=(2+2^2)+(2^3+2^4)+(2^5+2^6)+...+(2^{2021}+2^{2022})\\=2\cdot(1+2)+2^3\cdot(1+2)+2^5\cdot(1+2)+...+2^{2021}\cdot(1+2)\\=2\cdot3+2^3\cdot3+2^5\cdot3+...+2^{2021}\cdot3\\=3\cdot(2+2^3+2^5+..+2^{2021})\)
Vì \(3\cdot\left(2+2^3+2^5+...+2^{2021}\right)⋮3\)
nên \(A⋮3\).
\(Toru\)
A=(2+22)+22(2+22)+...+22020(2+22)
A= 6.1+22.6+...+22020.6
A=6(1+22+...+22020) chia hết cho 3
vậy A chia hết cho 3
=> 2A =2 + 22 + 23 + ... + 22020
=> 2A-A =( 2 + 22 + 23 + ... + 22020)- (1 + 2 + 22 + 23 + ... + 22019)
=> A =22020-1
=> A+1 =22020
Vậy A + 1 là một số chính phương
A = 1 + 2 + 22 + ... + 22021
2A = 2 + 4 + 23 + ... 22022
A = 22022 - 1
2A=2*(1+2+22+...+22020)=2+22+...+22021
2A-A=(1+2+22+...+22021)-(1+2+22+...+22020)
A=22021-1<2021
Giải:
A=1+2+22+23+...+22020
2A=2+22+23+24+...+22021
2A-A=(2+22+23+24+...+22021)-(1+2+22+23+...+22020)
A=22021-1
⇒A<22021
Chúc bạn học tốt!
Ta có: A = 4 + 22 + 23 +24 +.....+22019 +22020
=> 2A = 8 +23 +24 + 25 +.......+22020 +22021
=> 2A - A = 22021 - 23
=> A = 22021 - 23
\(2P=2^{2021}+2^{2020}+...+2^3+2^2+2\)
\(P=2P-P=2^{2021}-1\)
\(\Rightarrow Q=2020^{2^{2021}-1}\)
P = 22020 + 22019 + ....+ 22 + 2 +1
=> 2P = 22021 + 22020 + ....+ 23 + 22 + 2
=> 2P-P = (22021 + 22020 + ....+ 23 + 22 + 2 )- ( 22020 + 22019 + ....+ 22 + 2 +1 )
=> P = 22021 + 22020 + ....+ 23 + 22 + 2 - 22020 - 22019 - ...- 22 - 2 - 1
=>P = 22021-1
Ta có :
Q = 2020p
=> \(Q=2020^{2^{2021}-1}\)