A=3/1+3/3+3/6+...+3/2033136
A=2(3/2+3/6+3/12+...+3/4066272)
A=2.3.(1/1.2+1/2.3+...+1/2016.2017)
A=6.(1-1/2+1/2-1/3+...+1/2016-1/2017)
A=6.(1-1/2017)=336/2017
Vậy A=336/2017
TÍNH GIÁ TRỊ BIỂU THỨC A=2016+(2016/1+2)+(2016/1+2+3)+....+(2016/1+2+3+4+...+2016)
Cho
A = 1/2 + 1/3 + 1/4 + ... + 1/2017
B = 1/2016 + 2/2015 +3/2014+ ...+ 2015/2 + 2016/1
Tính B : A
Tính A =1/3 + 1/3^2 + 1/3^3 + 1/3^4 +....+1/3^2016
tính gt của biểu thức:
1+1/2.(1+2)+1/3.(1+2+3)+1/4.(1+2+3+4)+...+1/2016.(1+2+3+...+2016)
a)A=\(\frac{\frac{1}{2}+\frac{1}{3}+...+\frac{1}{2012}}{\frac{2011}{1}+\frac{2010}{2}+\frac{2009}{3}+...+\frac{1}{2011}}\)
b)A =\(\frac{1}{2}+\frac{1}{3}+...+\frac{1}{2016}+\frac{1}{2017}\)và B = \(\frac{2016}{1}+\frac{2015}{2}+\frac{2014}{3}+...+\frac{2}{2015}+\frac{3}{2016}\)
Tính \(\frac{B}{A}\)
Tính
A=3^2016 - 3^2015 + 3^2014 - 3^2013 + ......+ 3^2 - 3 + 1
B= 4^2016 - 4^2015 + 4^2014 - 4^2013 + ......+4^2 - 4 + 1
tính hợp lí ( nếu có):
a) (1/2-1). ( 1/3-1)....(1/2016-1)
b) (2/1/3+3/1/2):(-4/1/6+3/1/7)+7/1/2
Tính 1+ 1/2+ 1/1+2+3+ 1/1+2+3+4+...+1/1+2+3+...+2016
Tính :A= [(2018/1)+(2017/2)+(2016/3)+(2015/4)+...+(4/2015)+(3/2016)+(2/2017)+(1/2018)]/[(2019/1)+(2019/2)+(2019/3)+(2019/4)+...+(2019/2015)+(2019/2016)+(2019/2017)+(2019/2018)+(2019/2019)]