-x - 9/2004 = -1/ 2003
tìm x
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\(-x-\frac{9}{2004}=-\frac{1}{2003}\)
\(\Rightarrow-x=\frac{-1}{2003}+\frac{9}{2004}\)
\(\Rightarrow-x=\frac{-1}{2003}+\frac{9}{2004}\)
\(\frac{5}{9}-x=1-2004\)
\(\Rightarrow\frac{5}{9}-x=-2003\)
\(\Rightarrow x=\frac{5}{9}-\left(-2003\right)\)
\(\Rightarrow x=\frac{18032}{9}\)
a )
\(-x-\frac{9}{2004}=-\frac{1}{2003}\)
\(-x=-\frac{1}{2003}+\frac{9}{2004}\)
Số lớn quá
b ) \(\frac{5}{9}-x=\frac{1}{2004}\)
\(x=\frac{5}{9}-\frac{1}{2004}\)
\(x=\frac{3337}{6012}\)
\(\frac{2006\times2004-9}{1995+2004\times2005}=\frac{\left(2005+1\right)\times2004-9}{1995+2004\times2005}\)
\(=\frac{2005\times2004+2004-9}{2004\times2005+1995}\)
\(=\frac{2005\times2004+1995}{1995+2004\times2005}\)
\(=1\)
2006x 2004 -9/1995 +2004x 2005
=(2005+1)x2004 -9/1995+2004x2005
=2005x2004+2004 x1-9/1995+2005x2004
=2005x2004+2004-9/1995+2004x2005
=2005x2004+1995/1995+2005x2004
=1
\(\frac{1}{4\cdot9}+\frac{1}{9\cdot14}+\frac{1}{14\cdot19}+...+\frac{1}{1999+2004}\).
Có sai đề không vậy???
Sửa đề một chút :v
\(\frac{1}{4\cdot9}+\frac{1}{9\cdot14}+\frac{1}{14\cdot19}+...+\frac{1}{1999\cdot2004}\)
\(=\frac{1}{5}\left[\frac{5}{4\cdot9}+\frac{5}{9\cdot14}+\frac{5}{14\cdot19}+...+\frac{5}{1999\cdot2004}\right]\)
\(=\frac{1}{5}\left[\frac{1}{4}-\frac{1}{9}+\frac{1}{9}-\frac{1}{14}+...+\frac{1}{1999}-\frac{1}{2004}\right]\)
\(=\frac{1}{5}\left[\frac{1}{4}-\frac{1}{2004}\right]\)
\(=\frac{1}{5}\cdot\frac{125}{501}=\frac{25}{501}\)
Đặt A =1/4 x 9 + 1/9 x 14 + 1/14 x 19 +...+ 1/1999 + 2004. Ta có:
A= 1/4 x 9 + 1/9 x 14 + 1/14 x 19 +...+ 1/1999 + 2004
5A= 5/4 x 9 + 5/9 x 14 + 5/14 x 19 +...+ 5/1999 + 2004
5A= 1/4 - 1/9 + 1/9 - 1/14 + 1/14 - 1/19 +...+ 1/1999 - 1/2004
5A= 1/4 - 1/2004
A= (1/4 - 1/2004)/5
\(\frac{-x-9}{2004}=\frac{-1}{2003}\)
\(\Rightarrow\left(-x-9\right).2003=-2004\)
\(\Rightarrow-x-9=\frac{-2004}{2003}\)
\(\Rightarrow-x=\frac{16023}{2003}\)
\(\Rightarrow x=-\frac{16023}{2003}\)