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\(\dfrac{2011}{2010}=1-\dfrac{1}{2010}\)
\(\dfrac{97}{96}=1-\dfrac{1}{96}\)
mà 1/2010<1/96
nên 2011/2010>97/96
Mình chỉ làm được câu a thôi!!!!
2010/2009 và 2011/2010
Ta có:
2010-1+1/2009=2009+1/2009=2009/2009+1/2009=1+1/2009
2011-1+1/2010=2010+1/2010=2010/2010+1/2010=1+1/2010
Vì 2009<2010=>1/2009>1/2010
=>1+1/2009>1+1/2010
=>2010/2009>2011/2010
Vậy 2010/2009>2011/2010
nghịch dảo 2 p/s ta có:
\(\frac{2010}{2009}v\text{à}\frac{2011}{2010}\)
\(\frac{2010}{2009}=1\frac{1}{2009}\) ;\(\frac{2011}{2010}=1\frac{1}{2010}\)
vì \(\frac{1}{2009}>\frac{1}{2010}\)
=>\(\frac{2009}{2010}<\frac{2010}{2011}\)
vì nghịch đảo nên có điều trên
1-\(\frac{2009}{2010}=\frac{2010}{2010}-\frac{2009}{2010}=\frac{1}{2010}\)
1-\(\frac{2010}{2011}=\frac{2011}{2011}-\frac{2010}{2011}=\frac{1}{2011}\)
Vì 2010 < 2011 nên \(\frac{1}{2010}>\frac{1}{2011}nên\frac{2009}{2010}>\frac{2010}{2011}\)
Vậy \(\frac{2009}{2010}>\frac{2010}{2011}\)
\(A-B=\frac{10}{10^{2012}}-\frac{10}{10^{2011}}=\frac{1}{10^{2009}}-\frac{1}{10^{2010}}>0\)
\(\Rightarrow A>B\)
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bai thi .....................kho..........................kho..............troi.................thilanh.............................ret..................wa.........................dau................wa......................tich....................ung.....................ho.....................cho............do.................lanh...............tho...................bang..................mom...................thi...................nhu..................hut.....................thuoc................la.................lanh wa
\(\dfrac{2011}{2010}=1-\dfrac{1}{2010}\)
\(\dfrac{97}{96}=1-\dfrac{1}{96}\)
mà -1/2010>-1/96
nên 2011/2010>97/96