Rút gọn phân thức
a) \(\frac{4024.2014-2}{2001+2012.2013}\)
b) \(\frac{2012.2013+2014}{2010-2012.2015}\)
c) \(\frac{66666.87564-33333}{22222.87560+77777}\)
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\(A=\frac{2012.2013+2014}{2010-2012.2015}\)
\(=\frac{2012.2013+2014}{2010-2012.\left(2013+2\right)}\)
\(=\frac{2012.2013+2014}{2010-2012.2013-4024}\)
\(=\frac{2012.2013+2014}{-2012.2013-2014}=-1\)
\(A=\dfrac{2012\left(2012+1\right)+2012+2}{2012-2-2012\cdot2015}\)
\(=\dfrac{2012^2+2012\cdot2+2}{2012-2-2012\left(2012+3\right)}\)
\(=\dfrac{2012^2+4026}{-2012^2-4026}=-1\)
Ta có : \(Q=\frac{2010+2011+2012}{2011+2012+2013}\)
\(\Rightarrow Q=\frac{2010}{2011+2012+2013}+\frac{2011}{2011+2012+2013}+\frac{2012}{2011+2012+2013}\)
Mà \(\frac{2010}{2011}>\frac{2010}{2011+2012+2013}\)
\(\frac{2011}{2012}>\frac{2011}{2011+2012+2013}\)
\(\frac{2012}{2013}>\frac{2012}{2011+2012+2013}\)
Cộng vế theo vế, ta có : \(\frac{2010}{2011}+\frac{2011}{2012}+\frac{2012}{2013}>\frac{2010+2011+2012}{2011+2012+2013}\)
\(\Rightarrow P>Q\)
Ta có:
2010/2011 >2010/2011+2012+2013. ;2011/2012 >2011/2011+2012+2013 .;2012/2013 >2012/2011+2012+2013 ->2010/2011+2011/2012+2012/2013 >2010+2011+2012/2011+2012+2013. Vậy P > Q
a)N=\(\frac{5\cdot2^{18}\cdot3^{18}\cdot2^{12}-2\cdot2^{28}\cdot3^{14}\cdot3^6}{5\cdot2^{28}\cdot3^{19}-7\cdot2^{29}\cdot3^{18}}=\frac{2^{30}\cdot3^{18}\cdot5-2^{29}\cdot3^{20}}{2^{28}\cdot3^{18}\cdot\left(5\cdot3-7\cdot2\right)}\)
\(=\frac{2^{29}\cdot3^{18}\cdot\left(5\cdot2-3\cdot3\right)}{2^{28}\cdot3^{18}}=\frac{2^{29}\cdot3^{18}}{2^{28}\cdot3^{18}}=2\)
Vậy N=2
a/ \(\frac{2.2012.2014-2}{2011+2012.\left(2014-1\right)}=\frac{2.\left(2012.2014-1\right)}{2011+2012.2014-2012}\)
\(=\frac{2.\left(2012.2014-1\right)}{2012.2014-1}=2\)
b/ \(\frac{2012.2013+2014}{2010-2012.\left(2013+2\right)}=\frac{2012.2013+2014}{2010-2012.2013-4024}\)
\(=\frac{2012.2013+2014}{-\left(2012.2013+2014\right)}=-1\)
c/ \(\frac{6.11111.87564-3.11111}{2.11111\left(87564-4\right)+7.11111}=\frac{6.87564-3}{2.87564-8+7}\)
\(=\frac{3\left(2.87564-1\right)}{2.87564-1}=3\)