B=1/1x3 + 1/3x5 +...+ 1/2015x2017
B=1/2x(1/1-1/3+1/3-1/5+...+1/2015-1/2017)
B=1/2x(1/1-1/2017)
B=1/2x2016/2017
B=1008/2017
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2) \(A=\frac{3^{2017}+5}{3^{2015}+5}vàB=\frac{3^{2015}+1}{3^{2013}+1}\)so sánh A,B
Tính :
A = 1 + (-2) + 3 + (-4) + ... + 2014 + (-2015)
B = 1 + (-3) + 5 + (-7) + ... + 2015 + (-2017)
C = 1 + (-2) + (-3) + 4 + 5 + (-6) + (-7) + 8 + ... + (-1998) + (-1999) + (-2000) + 2001
A= ( 1/2017+ 2/2016+ 3/2015+...+ 2015/3+ 2016/2+ 2017) : ( 1/2+1/3+1/4+...+1/2017+1/2018)
So Sánh
M = \(\frac{2017^{2015}+1}{2017^{2015}-1}\)và N = \(\frac{2017^{2015}-5}{2017^{2015}-3}\)
cho a=1/2+1/3+1/4+...+1/2018 và b=1/2017+2/2016+3/2015+...+2017/1. Tính a/b
(1+1/1×3 )×(1+1/2×4)×(1+1/3×5)×...×(1+1/2015×2017)×1/2016
tính nhanh
A=1+3-5+7-..........-2013+2015
B=1-2+3-4+...................2015-2016
C=1-2-3+4+5-6-6+8+...........+2013-2014-2015+2016
D=1-4+7-10+.....-2014+2017
E=1+2-3-3+5+6 -.......+2013+2014-2015-2016
F=1-2+3-4+..........+2015+2016
G=1+3-5-7+9+11.............-2013-2015
H=1-2-34+5-6-7+8+.................+1013-1014-1015+1016
Cho biểu thức A = 1/1*2*3+1/2*3*4+1/3*4*5+...+1/2015*2016*2017
tính : B=1 × 2 × 3 × 4 + 2 × 3 × 4 × 5+...+2014 × 2015 × 2016 × 2017