(2013.2014+2014.2015+2015.2016)(1+\(\frac{1}{3}-1-\frac{1}{3}\))
=(2013.2014+2014.2015+2015.2016).0
=0
(2013.2014+2014.2015+2015.2016)(1+\(\frac{1}{3}-1-\frac{1}{3}\))
=(2013.2014+2014.2015+2015.2016).0
=0
Các bạn giúp mình bài này với nhé:
Câu 1. Tính:
a) A = 1+2-3-4+5+6-7-8+...-2012+2013+2014-2015-2016
b) B = ( 1-1/4) x (1-1/9) x...x (1-1/196)
Cảm ơn các bạn nhiều nha!!!!!
Tính:
\(\frac{1}{1+\frac{2013}{2014}+\frac{2013}{2015}}+\frac{1}{1+\frac{2014}{2015}+\frac{2014}{2013}}+\frac{1}{1+\frac{2015}{2013}+\frac{2015}{2014}}\)
tinh 1+2-3-4+5+6-7-8+9+...+2013+2014-2015-2016
Chứng minh
\(Â=\dfrac{2013}{2013+2014}+\dfrac{2014}{2014+2015}+\dfrac{2015}{2015+2016}+\dfrac{2016}{2016+2017}< 2\)
Cho A = \(\dfrac{1}{2014}\)+\(\dfrac{2}{2013}\)+\(\dfrac{3}{2012}\)+...+\(\dfrac{2013}{2}\)+2014
B = \(\dfrac{1}{2}\)+\(\dfrac{1}{3}\)+\(\dfrac{1}{4}\)+...+\(\dfrac{1}{2015}\)
Tính giá trị \(\dfrac{A}{B}\)
So sánh: (20142014 + 1) / (20142015+ 1) , (20142015 + 1) / (20142016 + 1)
So sánh A = \(\dfrac{10^{2014}+2016}{10^{2015}+2016}\) và B = \(\dfrac{10^{2015}+2016}{10^{2016}+2016}\) giúp mình nhanh với
So sánh
A=\(\frac{2015^{2014}+1}{2015^{2014}-1}\) B=\(\frac{2015^{2014}-1}{2015^{2014}-3}\)
\(A=\dfrac{2016^2+1^2}{2016\cdot1}+\dfrac{2015^2+2^2}{2015\cdot1}+\dfrac{2014^2+3^2}{2014\cdot3}+...+\dfrac{1009^2+1008^2}{1009\cdot1008}\)
và \(B=\dfrac{1}{2}+\dfrac{1}{3}+\dfrac{1}{4}+...+\dfrac{1}{2017}\)Tìm A/B