Các câu hỏi tương tự
chung minh rang
A = 1/5+1/5^2+1/5^3+...+1/5^2008<1/4
tính tổng sau :\(c=\frac{\frac{1}{2008}-\frac{1}{2009}-\frac{1}{2010}}{\frac{5}{2008}-\frac{5}{2009}-\frac{5}{2010}}+\)\(\frac{\frac{2}{2007}-\frac{2}{2008}-\frac{2}{2009}}{\frac{3}{2007}-\frac{3}{2008}-\frac{3}{2009}}\)
Ét o ét🆘
C=1/(-5)+1/(-5)^2+1/(-5)^3+…+1/(-5)^99
(x-3y)^2006+(y+4)^2008=0
Hép mi hép mi
tính:
G = \(\frac{1}{5}+\frac{1}{5^2}+\frac{1}{5^3}+...+\frac{1}{5^{2008}}\)
Rút gọn:A=1+5+5^2+5^3+...5^2008+5^200
Tính \(\frac{1}{5}+\frac{1}{5^2}+\frac{1}{5^3}+...+\frac{1}{5^{2008}}\)
Tính tổng A= 1+5+5^2+5^3+5^4+...........+5^2008+5^2009
1.Tìm x biết:
a) 7x+2+7x+1+7/57=52x+52x+1+52x+3/131.
b) (4x-3)2=(4x-3)3.
c) |5(2x+3)|+|2(2x+3)|+|2x+3|=16.
d) |x2+|6x-2||=x2+4.
2.Tính tỉ số A/B,biết:
A=1/2+1/3+1/4+...+1/2007+1/2008+1/2009.
B=2008/1+2007/2+2006/3+...+2/2007+2/2008.
B= 1/2+ (1/2)^2+(1/3)^3+.......+ (1/2)^99
C=2^100-2^99+2^98-2^97+.....+ 2^2-2
D= 2^2010- 2^2009-2^2008-.....-2^2-1
E=5^3+5^6+5^9+......+ 5^2010+5^2013