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Ta có: \(2004A=\dfrac{2004^{2004}+2004}{2004^{2004}+1}=1+\dfrac{2003}{2004^{2004}+1}\)
\(2004B=\dfrac{2004^{2003}+2004}{2004^{2003}+1}=1+\dfrac{2003}{2004^{2003}+1}\)
Vì \(\dfrac{2003}{2004^{2004}+1}< \dfrac{2003}{2004^{2003}+1}\Rightarrow1+\dfrac{2003}{2004^{2004}+1}< 1+\dfrac{2003}{2004^{2003}+1}\)
\(\Rightarrow2004A< 2004B\)
\(\Rightarrow A< B\)
Vậy A < B
đặt \(A=2004^{2003}+2004^{2002}+...+2004^2+2004+1\)
\(2004A=\left(2004^{2004}+2004^{2003}+2004^{2002}+...+2004^3+2004^2+2004\right)\)
\(2004A-A=2004^{2004}-1\)
\(A=\frac{2004^{2004}-1}{4}\)
mình chỉ biết đến đây thôi
a) \(1-2-3+4+5-6-7+...+2001-2002-2003+2004\)
\(=\left(1-2-3+4\right)+\left(5-6-7+8\right)+...+\left(2001-2002-2003+2004\right)\)
\(=0+0+...+0=0\)
b) \(1+2-3-4+5+6-7-8+...+2001+2002-2003-2004\)
\(=\left(1+2-3-4\right)+\left(5+6-7-8\right)+...+\left(2001+2002-2003-2004\right)\)
\(=\left(-4\right)+\left(-4\right)+...+\left(-4\right)\)
\(=\left(-4\right)\cdot501=\left(-2004\right)\)
a) Ta có: \(1-\frac{2002}{2003}=\frac{1}{2003}\)
\(1-\frac{2003}{2004}=\frac{1}{2004}\)
Vì \(\frac{1}{2003}>\frac{1}{2004}\)
\(\Rightarrow\frac{2002}{2003}>\frac{2003}{2004}\)
b) Ta có: \(\frac{-2005}{-2004}=\frac{2005}{2004}>1\)
\(\frac{-2002}{2003}