tính (2015)+2017+2016+2017
so sánh hai phân số A=2015/2016+2016/2017+2017/2018 và 2015+2016+2016/2016+2017+2018
2/ Cho M = 32 + 102011 + 102012 + 102013 + 102014
a/ CM : Mc hia hết cho 8
b/ Tìm số dư khi chia M cho 24
x-327=(-5)3.(+3)
-7x=28
(x+2015).(x-2016)=0
[x-3]+1=7
Tính bằng cách hợp lí :
a , \(\dfrac{1}{15}+\dfrac{9}{10}+\dfrac{14}{15}-\dfrac{11}{9}-\dfrac{20}{10}+\dfrac{1}{157}\)
b , \(\dfrac{1}{5}-\dfrac{-1}{3}+\dfrac{-1}{5}-\dfrac{2}{6}\)
c , \(\dfrac{2}{1\times3}+\dfrac{2}{3\times5}+...+\dfrac{2}{2015\times2017}\)
d , \(\dfrac{5}{1\times3}+\dfrac{5}{3\times5}+...+\dfrac{5}{2015\times2017}\)
e , \(\dfrac{1}{1\times2}+\dfrac{1}{3\times4}+...+\dfrac{1}{2016\times2017}\)
12.x-33=3^2014/3^2013
Sắp xếp phân số theo thứ tự tăng dần :
39/1993; 100/95; 100/33; 30/2013;100/21; 100/92; 20/2013; 39/2013; 13/2013; 100/83; 100/29; 19/2013; 85/100; 39/1995; 21/2013; 17/2013; 100/49; 24/2013 ; 100/98; 39/1997
1+ 2+ 3+ .... +2012 +2013 =?
Cho A= \(1+\dfrac{1}{2}+\dfrac{1}{3}+\dfrac{1}{4}+...+\dfrac{1}{4026}\) , B = \(1+\dfrac{1}{3}+\dfrac{1}{5}+\dfrac{1}{7}+....+\dfrac{1}{4025}\). So sánh \(\dfrac{A}{B}\) với \(1\dfrac{2013}{2014}\)
