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Nhầm !!!!!
\(B-A=\frac{2012^{101}}{2011}-\frac{2012^{101}-1}{2011}=\frac{2012^{101}-\left(2012^{101}-1\right)}{2011}=\frac{1}{2011}\)
OK NHA
A = 1 + 2012 + 20122 + ... + 2012100
2012A = 2012 + 20122 + 20123 + ... + 2012101
2012A - A = (2012 + 20122 + 20123 + ... + 2012101) - (1+ 2012 + 20122 + ...+ 2012100)
2011A = 2012101 - 1
A = \(\frac{2012^{101}-1}{2011}\)
=> B - A = \(\frac{2012^{101}}{2011}-\frac{2012^{101}-1}{2011}=\frac{2012^{101}-\left(2012^{101}-1\right)}{2011}=\frac{2012^{101}-2012^{101}+1}{2011}=\frac{1}{2011}\)
\(B=1+2012+2012^2+2012^3+...+2012^{100}\)
2012B= 2012 + 2012^2 + 2012^3 + ... + 2012^101
2012B - B = (2012 + 2012^2 + 2012^3 + ... + 2012^101) - (1+ 2012 + 2012^2 + ...+ 2012^100)
2011B = 2012^101 - 1
B = \(\frac{2012^{101}-1}{2011}\)
=> C - B = \(\frac{2012^{101}}{2011}-\frac{2012^{101}-1}{2011}=\frac{2012^{101}-\left(2012^{101}-1\right)}{2011}\)\(=\frac{2012^{101}-2012^{101}+1}{2011}=\frac{1}{2011}\)
lầm sau đừng viết chữ to chữ nhỏ nữa nhe oOo _ Virgo _ oOo ^_^^_^^_^
Ta có :
\(A=1+2012+2012^2+2012^3+........+2012^{100}\)
\(2012A=2012+2012^2+2012^3+......+2012^{100}+2012^{101}\)
\(\Rightarrow2012A-A=\left(2012+2012^2+.......+2012^{101}\right)-\left(1+2012+........+2012^{100}\right)\)
\(2011A=2012^{101}-1\)
\(\Rightarrow A=\dfrac{2012^{101}-1}{11}\)
Mà \(B=\dfrac{2012^{101}}{2011}\)
\(\Rightarrow B-A=\dfrac{2012^{101}}{2011}-\dfrac{2012^{101}-1}{2011}\)
\(=\dfrac{2012^{101}-\left(2012^{101}-1\right)}{2011}\)
\(=\dfrac{2012^{101}-2012^{101}+1}{2011}\)
\(=\dfrac{1}{2011}\)
~ Chúc bn học tốt ~
Có: \(2012A=2012+2012^2+...+2012^{101}\)
=> \(2012A-A=\left(2012+2012^2+...+2012^{101}\right)-\left(1+2012+...+2012^{100}\right)\)
\(\Rightarrow2011A=2012^{101}-1\)
\(\Rightarrow A=\dfrac{2012^{101}-1}{2011}\)
Do đó \(B-A=\dfrac{2012^{101}}{2011}-\dfrac{2012^{101}-1}{2011}=\dfrac{1}{2011}\)