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
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
2^200-2^199-2^198-....-2-1
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