2002*2005+1005
2003*2005-1000
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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: \(\frac{-2005}{-2004}=\frac{2005}{2004}>1\)
\(\frac{-2002}{2003}<1\)
\(\Rightarrow\frac{-2002}{2003}<\frac{-2005}{-2004}\)
\(A=\frac{2002}{2001}+\frac{2003}{2002}+\frac{2004}{2003}+\frac{2005}{2004}+\frac{2006}{2005}+\frac{2007}{2006}+\frac{2008}{2007}+\frac{2009}{2008}>\frac{2001}{2001}+\frac{2002}{2002}+\frac{2003}{2003}+\frac{2004}{2004}+\frac{2005}{2005}+\frac{2006}{2006}+\frac{2007}{2007}+\frac{2008}{2008}\)
\(A=\frac{2002}{2001}+\frac{2003}{2002}+\frac{2004}{2003}+\frac{2005}{2004}+\frac{2006}{2005}+\frac{2007}{2006}+\frac{2008}{2007}+\frac{2009}{2008}>1+1+1+1+1+1+1+1\)\(A=\frac{2002}{2001}+\frac{2003}{2002}+\frac{2004}{2003}+\frac{2005}{2004}+\frac{2006}{2005}+\frac{2007}{2006}+\frac{2008}{2007}+\frac{2009}{2008}>8\)
\(A>8\)
2002 x 2005 1005 / 2003 x 2005 - 1000 = 2002 : 2002 x 2005 + 1005 / 2002 : 2002 x 2005 + ( 2003 - 2002 ) x 2005 - 1000
= 1 x 2005 + 1005 / 1 x 2005 + 1 x 2005 - 1000
= 2005 + 1005 / 2005 + 2005 - 1000
= 3010 / 4010 - 1000
= 3010 / 3010 = 1
2002x2005+1005=4015015
2004x2005-1000=4015015