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\(A=2+2^2+2^3+...+2^{99}+2^{100}\)
\(\Rightarrow2A=2^2+2^3+2^4+...+2^{100}+2^{101}\)
\(\Rightarrow A=2^{101}-2\)
\(\Rightarrow A+2=2^{101}-2+2\)
\(\Rightarrow A+2=2^{101}\)
\(A=2+2^2+2^3+...+2^{100}\)
\(\Rightarrow2A=2.\left(2+2^2+2^3+...+2^{100}\right)\)
\(\Rightarrow2A=2^2+2^3+2^4+...+2^{101}\)
\(\Rightarrow2A-A=\left(2^2+2^3+2^4+...+2^{101}\right)-\left(2+2^2+2^3+...+2^{100}\right)\)
\(\Rightarrow A=2^{101}-2\)
\(\Rightarrow A+1=2^{101}-2+2\)
\(\Rightarrow A+2=2^{101}\)
Vậy A+2=2101
\(A=1+2+2^2+...+2^{30}\)
\(\Rightarrow2A=2+2^2+2^3+...+2^{31}\)
\(\Rightarrow2A-A=A=2^{31}-1\)
\(\Rightarrow A+1=2^{30}\)
\(A=1+2+2^2+...+2^{30}\)
\(2A=2+2^2+...+2^{30}+2^{31}\)
\(\Rightarrow A=2^{31-1}\)
Vậy : \(A+1=2^{31}\)
2A = 2 + 22 + 23 + ... + 2201
A = 2A - A = 2 + 22 + 23 + ... + 2201 - ( 1 + 2 + 22 + 23 + ... + 2200 )
= 2 + 22 + 23 + ... + 2201 - 1 - 2 - 22 - 23 - ... - 2200 = 2201 - 1
=> A + 1 = 2201 - 1 + 1 = 2201
Ta có: A=1+2+22+23+24+…+2200
=>2A=2+22+23+24+25+…+2201
=>2A-A=2+22+23+24+25+…+2201-1-2-22-23-24-…-2200
=>A=2201-1
=>A+1=2201
2A = 2 + 2^2+ 2^3+...+2^101
2A-A = 2^101- 1
=> A = 2^101- 1
=> A + 1 = 2^101
2A = 2 + 22 + 23 + ... + 2200 + 2201
2A - A = ( 2 + 22 + 23 +...+ 2200 + 2201 ) - ( 1 + 2 + 22 + 23 +...+ 2200 )
=> A = 2201 - 1
=> A +1= 2201
A=1+2+2^2+..+2^100
=>2A=2+2^+26+..+2^101
=>2A-A=(2+2^+26+..+2^101)-(1+2+2^2+..+2^100)
vậy A=2^101-1