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=2006×(2004+1)-1/2004×2006+2005
=2006×2004+2006×1-1/2004×2006+2005
=2006×2004+2005/2004×2006+2005
=1
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\(a,\left(\frac{1}{2}\cdot\frac{1}{3}+\frac{1}{4}-\frac{1}{5}\right):\frac{1}{4}:\frac{1}{6}\)
\(=\left(\frac{1}{6}+\frac{1}{4}-\frac{1}{5}\right)\cdot\frac{1}{4}\cdot\frac{1}{6}\)
\(=\left(\frac{10}{60}+\frac{15}{60}-\frac{12}{60}\right)\cdot\frac{1}{24}\)
\(=\frac{13}{60}\cdot\frac{1}{24}\)
\(=\frac{13}{1440}\)
\(b,\frac{2006\cdot2005-1}{2004\cdot2006+2005}\)
\(\frac{2006\cdot2005-1}{2004\cdot2006+2005}\)
\(=\frac{2006\cdot\left(2004+1\right)-1}{2004 \cdot2006+2005}\)
\(=\frac{2006\cdot2004+2006\cdot1-1}{2004\cdot2006+2005}\)
\(=\frac{2006\cdot2004+2005}{2004\cdot2006 +2005}=1\)
Mình nghĩ phần b, ko có cách 2 đâu bạn .
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\(\frac{2005.2007-1}{2004+2005.2006}\)
\(=\frac{2005.2006+2005-1}{2004+2005.2006}\)
\(=\frac{2005.2006+2004}{2004+2005.2006}\)
\(=1\)
\(=\frac{2015\left(2006+1\right)-1}{2004+2005.2006}=\frac{2005.2006+2005-1}{2004+2005.2006}=1\)
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\(\frac{\left(2005+1\right).125+1000}{\left(125+1\right).2005-888}\)
= \(\frac{2005.125+125+1000}{125.2005+2005-888}\)
= \(\frac{2005.125+1125}{125.2005+1117}\)
= \(\frac{250625+1125}{250625+1117}\)
= \(\frac{125875}{125871}\)
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\(\frac{2006x2005-1}{2004x2006+2005}\)
=\(\frac{2005-1}{2004+2005}\)
=\(\frac{2004}{4009}\)
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2005 x (2006 - 1 )
= 2005 x 2005
= 4020025
2005 x (2004 + 2005 )
= 2005 x ( 2004 + 1 ) = 2005 x 2005 = 4020025
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
2006 x 2005 - 1/2004 x 2006 + 2005
= 2006 x (2004 + 1) - 1/2004 x 2006 + 2005
= 2006 x 2004 + 2006 x 2005/2004 x 2006 + 2005
= 2006 x 2004 + 2005/2004 x 2006 + 2005
= 1
\(=\frac{2006.2004+2006-1}{2004.2006+2005}=\frac{2006.2004+2005}{2004.2006+2005}=1\)
Việt làm đúng rồi nên mik ko Cần giải cho bạn nữa ,OK?