Tính nhanh 2006x2007-2/2005x2006+2004
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{2006\times2007-2593}{2005\times2006+1419}\)
\(=\frac{2005\times2006+4012-2593}{2005\times2006+1419}\)
\(=\frac{2005\times2006+1419}{2005\times2006+1419}\)
\(=1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
C=(2005x2006+2005-1)/(2004+2005x2006)=
(2005x2006+2004)/(2004+2005x2006)=1
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{2005.2007-1}{2004+2005.2006}\)
\(=\frac{2005.\left(2006+1\right)-1}{2004+2005.2006}\)
\(=\frac{2005.2006+2005-1}{2004+2005..2006}\)
\(=\frac{2005.2006+2004}{2004+2005.2006}\)
\(=1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{2005\times2007-1}{2004+2005\times2006}\)
\(=\frac{2005\times\left(2006+1\right)-1}{2004+2005\times2006}\)
\(=\frac{2005\times2006+2005\times1-1}{2004+2005\times2006}\)
\(=\frac{2005\times2006+2005-1}{2004+2005\times2006}\)
\(=\frac{2005\times2006+2004}{2004+2005\times2006}\)
\(=1\)
_Chúc bạn học tốt_
![](https://rs.olm.vn/images/avt/0.png?1311)
= 2006 x ( 2005 + 2 ) - 1997 / 2006 x 2005 + 2015
= 2006 x 2005 + 2006 x 2 -1997 / 2006 x 2005 + 2015
= 2006 x 2005 + 4012 - 1997 / 2006 x 2005 + 2015
= 2006 x 2015 + 2015 / 2006 x 2005 + 2015
= 1
Nhớ k nha
\(\frac{2006\times2007-1997}{2006\times2005+2015}=\frac{2006\times\left(2005+2\right)-1997}{2006\times2005+2015}\)
\(=\frac{2006\times2005+2006\times2-1997}{2006\times2005+2015}\)
\(=\frac{2006\times2005+4012-1997}{2006\times2005+2015}=\frac{2006\times2005+2015}{2006\times2005+2015}=1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{2006.2007-3}{2005.2007+2004}=\frac{2005.2007+2007-3}{2005.2007+2004}=\frac{2007-3}{2004}=\frac{2004}{2004}=1\)
Đúng 100%
Đúng 100%
Đúng 100%
=4030052
sửa đề : \(\frac{2006\cdot2007-2008}{2005\cdot2006+2004}\)
\(=\frac{2006\cdot2005+2006\cdot2-2008}{2005\cdot2006+2004}\)
\(=\frac{2006\cdot2005+4012-2008}{2005\cdot2006+2004}\)
= 1