Tuyển Cộng tác viên Hoc24 nhiệm kì 26 tại đây: https://forms.gle/dK3zGK3LHFrgvTkJ6
Chung minh rang: B=1 + 1/2 + 1/3 + 1/4 +1/5 + .....+ 1/22016 - 2 + 1/22016 - 1 > 1008
Cho A=1/2!+2/3!+3/4!+...+2015/2016!
Chung minh :A<1
Cho A=1/2!+2/3!+3/4!+...+2015/2016!
Chung minh :A<1
a. So sanh 2 phan so:A= 2015/2016+2016/2017+2017/2018 va B = 2015+2016+2017/2016+2017+2018
b.1/2.4+1/4.6+........+1/(2x-2).2x = 1/8
c.Cho A = 1/4+1/9+1/16+...+1/81+1/100 . Chung minh rang : A > 65/132
d.Cho B = 12/(2 . 4 ) ^ 2 + 20/ (4 . 6) ^2 + ...........+ 388/ ( 96 . 98 ) ^ 2 + 396/ ( 98 . 100 ) ^2 .Hay so sanh B voi 1 /4
Cho A=1/2!+2/3!+3/4!+...+2015/2016!
Chung minh :A<1
cach lam day du thi minh se tick
Cho A=1/2!+2/3!+3/4!+...+2015/2016!
Chung minh :A<1
cach lam day du thi minh se tick
a). Cho A=\(\frac{1}{2^2}\)+\(\frac{1}{3^2}\)+\(\frac{1}{4^2}\)+....+\(\frac{1}{2015^2}\).
Chung minh rang : A < 1.
b). Cho B=\(2^1\)+\(2^2\)+\(2^3\)+....+\(2^{2016}\).
Chung minh rang : B chia het cho 21.
chung minh rag: a,1/2+1/2^2+1/2^3+,....+1/2^2016 <1 b,1.3.5.7.....39/21.22.23.....40=1/2^20 c,1.3.5.....(2n-1)/(n+1)(n+2)(n+3).....2n=1/2n
Cho A=1/2!+2/3!+3/4!+...+2015/2016!
Chung minh :A<1
Cac ban oi giup minh di
Thank
