Đặt \(\frac{2016}{2017}\)+\(\frac{2017}{2018}\)+\(\frac{2018}{2019}\)+\(\frac{2019}{2016}\) là A
A=1-\(\frac{1}{2017}\)+1-\(\frac{1}{2018}\)+1-\(\frac{1}{2019}\)+1+\(\frac{3}{2016}\)
A=4-(\(\frac{1}{2017}\)+\(\frac{1}{2018}\)+\(\frac{1}{2019}\)-\(\frac{3}{2016}\)) Do \(\frac{1}{2017}\)+\(\frac{1}{2018}\)+\(\frac{1}{2019}\)-\(\frac{3}{2016}\)<0 =>A>41) so sánh
a) 58/63 và 36/55
b) 27/53 và 36/74
c) A= 2017/2016 +1 /2017/2017 +1 và B= 2017/1017 +1 /2017/2018 +1
cho A=\(\frac{2015}{2016}\)+\(\frac{2016}{2017}\)+\(\frac{2017}{2018}\)+\(\frac{2018}{2015}\) chứng minh A>4
giúp em với \(\dfrac{1}{1^2}+\dfrac{1}{2^2}+\dfrac{1}{3^2}+.........+\dfrac{1}{2017^2}\)
cho A=2^2018/2^2018 +3^2019 + 3^2019/3^2019+5^2020 + 5^2020/5^2020+2^2018
cho B=1/1x2+1/3x4+1/4x5+...+1/2019x1/2020 so sánh A và B làm nhanh nha các bạnCho A=3/1*2*3+3/2*3*4+3/3*4*5+.........+3/2015*2016*2017.
So sánh A với 1.
Cho S = \(\dfrac{1}{21}\)+ \(\dfrac{1}{22}\)+ ... + \(\dfrac{1}{30}\)
So sánh S với \(\dfrac{1}{3}\)
\(\dfrac{5}{9}+\dfrac{-4}{5}< \dfrac{x}{15}< \dfrac{-4}{9}+\dfrac{3}{5}\)
Làm nhanh giùm !!!!
Điền dấu thích hợp ( >, <, =) vào ô vuông :
a) \(\dfrac{-4}{7}+\dfrac{3}{-7}.......-1\)
b) \(\dfrac{-15}{22}+\dfrac{-3}{22}......\dfrac{-8}{11}\)
c) \(\dfrac{3}{5}.....\dfrac{2}{3}+\dfrac{-1}{5}\)
d) \(\dfrac{1}{6}+\dfrac{-3}{4}.......\dfrac{1}{14}+\dfrac{-4}{7}\)
bài 45: Tìm x, biết:
a) x=\(\dfrac{-1}{2}+\dfrac{3}{4}\); b) \(\dfrac{x}{5}=\dfrac{5}{6}+\dfrac{-19}{30}\)