Chứng minh :\(5^{2014}-5^{2013}+5^{2012}\) chia hêt cho 105
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Ta có : 52014 - 52013 + 52012
= 52012.(52 - 5 + 1)
= 52012.21
= 52011.5.21
= 52011.105 \(⋮\)105
=> 52014 - 52013 + 52012 \(⋮\)105
\(5^{2014}-5^{2013}+5^{2012}\)
= \(5^{2011}.\left(5^3-5^2+5\right)\)
= \(5^{2011}.105⋮105\)(ĐPCM)
\(A=5^{2014}-5^{2013}+5^{2012}=5^{2012}\left(5^2-5^1+5^0\right)=21.5^{2012}\\ \)
\(\hept{\begin{cases}105=21.5\\A=21.5^{2012}\end{cases}}\Rightarrow\frac{A}{105}=\frac{21.5^{2012}}{21.5}=5^{2011}\Rightarrow dpcm\)
5^2014-5^2013+5^2012=5^2012(5^2-5^1+1)
=5^2012.21
=5^2011.5.21
=5^2011.105
Vậy 5^2014-5^2013+5^2012 chia hết cho 105
\(5^{2014}-5^{2013}+5^{2012}\)
\(=5^{2011}.\left(5^3-5^2+5\right)\)
\(=5^{2011}.105\)\(⋮105\)
\(\Rightarrow5^{2014}-5^{2013}+5^{2012}⋮105\)\(\left(đpcm\right)\)
Ta có: \(5^{2014}-5^{2013}+5^{2012}=5^{2011}\left(5^3-5^2+5\right)\)
\(=5^{2011}.105⋮105\)
\(\Rightarrow5^{2014}-5^{2013}+5^{2012}⋮105\left(đpcm\right)\)
Vậy...
ta có:
\(5^{2014}-5^{2013}+5^{2012}\)
\(=5^{2012}\left(5^2-5+1\right)\)
\(=5^{2012}\left(25-5+1\right)\)
\(=5^{2012}.21\)
ta thấy: \(5^{2012}.21⋮21\)
\(5^{2012}.21⋮5\)
\(\Rightarrow5^{2012}.21⋮21.5\)
\(\Rightarrow5^{2012}.21⋮105\)
\(\Leftrightarrow5^{2014}-5^{2013}+5^{2012}⋮105\left(đpcm\right)\)
Ta có 52014 - 52013 + 52012
= 52012.(52 - 5 + 1)
= 52012.21
= 52011.5.21
= 52011.105 \(⋮\)105
=> 52014 - 52013 + 52012 \(⋮\)105
\(5^{2012}+5^{2013}+5^{2014}=5^{2012}\left(1+5+5^2\right)=5^{2012}\left(1+5+25\right)=31.5^{2012}\)
Luôn luôn chia hết cho 31
\(5^{2014}-5^{2013}+5^{2012}=5^{2011}\left(5^3-5^2+5\right)\)
\(=5^{2011}.\left(125-25+5\right)=5^{2011}.105⋮105\)
thank bạn nha