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$\frac{\frac{2010}{2011}}{\frac{2012}{2013}}+\frac{\frac{2011}{2012}}{\frac{2013}{2014}}+\frac{\frac{2012}{2013}}{\frac{2014}{2015}}$
$\frac{\frac{2010}{2011}}{\frac{2012}{2013}}+\frac{\frac{2011}{2012}}{\frac{2013}{2014}}+\frac{\frac{2012}{2013}}{\frac{2014}{2015}}$
$\frac{\frac{2010+2011+2012}{2011+2012+2013}}{\frac{2012+2013+2014}{2013+2014+2015}}$
$\frac{\frac{2010}{2011}+\frac{2011}{2012}+\frac{2012}{2013}}{\frac{2012+2013+2014}{2013+2014+2015}}$
$\frac{\frac{2010+2011+2012}{2011+2012+2013}}{\frac{2012}{2013}+\frac{2013}{2014}+\frac{2014}{2015}}$
a)
Ta có a > b vì b > 3 còn a < 3
b)
a. Ta có : 1/51 + 1/52 + 1/53 +...+ 1/60 < 1/51 x 10 < 1/50 x 10 = 1/5
=> 1/51 + 1/52 +1/53 +...+1/60 < 1/5
b. Ta có : 1/51 + 1/52 + 1/53 +...+ 1/60 > 1/60 x 10 = 1/6
=> 1/51 + 1/52 +1/53 +...+ 1/60 > 1/6
\(A=\frac{2012.2010+2013}{2011.2011+2012}\)
\(\Rightarrow A=\frac{\left(2011+1\right).\left(2011-1\right)+2013}{2011.2011+2012}\)
\(\Rightarrow A=\frac{2011\left(2011+1\right)-2011-1+2013}{2011.2011+2012}\)
\(\Rightarrow A=\frac{2011^2+2011-2011-1+2013}{2011^2+2012}\)
\(\Rightarrow A=\frac{2011^2-1+2013}{2011^2+2012}\)
\(\Rightarrow A=\frac{2011^2+2012}{2011^2+2012}=1\)
Vậy A = 1
\(A=2012.2010+\frac{2013}{2011}.2011+2012\)
\(\Rightarrow A=4044120+2013+2012\)
\(\Rightarrow A=4044120+4025\)
\(\Rightarrow A=4048145.\)
Vậy \(A=4048145.\)
1.
tong cua hai so la;
425x2=850
vi ab la so co hai chu so nen => 7ab hon ab la 700 don vi
so 7ab la:
(850+700):2=775
=> ab=75
2.
ta co
2010/2011=1-1/2011
2011/2012=1-1/2012
2012/2013=1-1/2013
2013/2014=1-1/2014
vi so bi tru deu la 1 nen ta co:
1/2011>1/2012>1/2013>1/2014
vay 2010/2011<2011/2012<2012/2013<2013/2014
a=b
l-i-k-e cho mình nha
a=b