\(=1+\dfrac{1}{2012}-1-\dfrac{1}{2013}-\dfrac{1}{2012}+\dfrac{1}{2013}=0\)
\(\dfrac{1}{4050156}\) - \(\dfrac{1}{2012x2013}\)
=
Tính:A=2012x2013/2012x2013+1 và B=2013/2012
So sánh:A=2012x2013/2012x2013+1 và B=2013/2012
So sánh phân số \(\dfrac{2012}{2013}\) với A, biết:
A = \(\dfrac{1}{11}\) + \(\dfrac{1}{12}\) + \(\dfrac{1}{13}\) + \(\dfrac{1}{14}\) + \(\dfrac{1}{15}\) + ... + \(\dfrac{1}{38}\) + \(\dfrac{1}{39}\) + \(\dfrac{1}{40}\)
Ai xong đầu tiên mình tick nhé.
Không tính cụ thể , hãy sắp xếp các biểu thức sau theo thứ tự giảm dần :
\(\frac{\frac{2010}{2011}}{\frac{2012}{2013}}+\frac{\frac{2011}{2012}}{\frac{2013}{2014}}+\frac{\frac{2012}{2013}}{\frac{2014}{2015}}\)
\(\frac{\frac{2010}{2011}+\frac{2011}{2012}+\frac{2012}{2013}}{\frac{2012}{2013}+\frac{2013}{2014}+\frac{2014}{2015}}\)
\(\frac{\frac{2010+2011+2012}{2011+2012+2013}}{\frac{2012+2013+2014}{2013+2014+2015}}\)
\(\frac{\frac{2010}{2011}+\frac{2011}{2012}+\frac{2012}{2013}}{\frac{2012+2013+2014}{2013+2014+2015}}\)
\(\frac{\frac{2010+2011+2012}{2011+2012+2013}}{\frac{2012}{2013}+\frac{2013}{2014}+\frac{2014}{2015}}\)
Tính hợp lý (2011/2012+2012/2013+2013/2014+2014/2015)×(1/5-2/3:10/3)
m-3 /2012 + m-2/ 2013 +m-1/ 2014 - 3 = 1/2012 +1/2013+1/2014
So sánh:\(\frac{2010}{2011}+\frac{2011}{2012}+\frac{2012}{2013}+\frac{2013}{2014}\)và\(\frac{2010}{2008}+\frac{2011}{2013}+\frac{2012}{2014}+\frac{2013}{2015}\)
giải giúp mình nhé. A=2012×2014+2015/2014+2013×2013
TÍNH NHANH ;
A= 1*2+2*3+3*4+....+2011*2012
B =2012*2013+2013*2014
