1/2+1/4+1/6+1/8+1/16+ +1/2048 hãy tính tổng ?
tính tổng sau:
1/2 + 1/4 + 1/8 + 1/16 ..... + 1/2048
2047/2048 nha mình làm ở violympic cấp tỉnh rồi
Tính tổng
a) 1/2x3 + 1/3x4 + 1/4x5 + ... + 1/2018x2019
b) 1/2 + 1/4 + 1/8 + 1/16 + ... + 1/2048
tính nhanh ;
1234.5678.(630 -315) :1996
319.45+ 55.319 /1995.1996 -1991.1995
1988.1996+1997.11+1985 /1997.1996-1995.1996
(1+2+4+8+.....+512) .(101.102-101.101-50-51) /2+4+6+8+16+....+1024+2048
(1+2+4+8+....+512).(135135.246-246246.135)/2+4+8+16+....+1024+2048
tinh tong sau 1/2 + 1/4 + 1/6 + 1/8 + 1/16+ ..........+ 1/2048
Tính S = 1+1/2+1/4+1/8+1/16+........+1/2048+1/4096
Ta co: 2S=2+1+1/2+1/4+...+1/2048
2S-S=2+1+1/2+1/4+...+1/2048-1-1/2-1/4-...-1/2048-1/4096
\(\Rightarrow\)S=2-1/4096 =8191/4096
1. Tính Tổng các sô sau
a)A=1+2+3+6+.......+760
b)B=2+3+5+10+20+40+80+.....+2560
c)C=3+4+7+14+28+56+...+7168
d)D=1+3+4+8+16+...2048
1-1/2-1/4-1/8-1/16-1/32-...-1/1024-1/2048
tính nhanh
Đặt \(A=1-\frac{1}{2}-\frac{1}{4}-\frac{1}{8}-..-\frac{1}{2048}\)
\(\Rightarrow A=1-\left(1-\frac{1}{2}\right)-\left(\frac{1}{2}-\frac{1}{4}\right)-..-\left(\frac{1}{1024}-\frac{1}{2048}\right)\)
\(\Rightarrow A=1-1+\frac{1}{2}-\frac{1}{2}+\frac{1}{4}-..-\frac{1}{1024}+\frac{1}{2018}\)
\(\Rightarrow A+\frac{1}{2018}\)
1-1/2-1/4-1/8-1/16-1/32-1/64-1/128-1/256-1/512-1/1024-1/2048 =0.00048828125
1/2+1/4+1/8+1/16+..........................+1/2048
Gọi biểu thức trên là A Ta có :
A = \(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+......+\frac{1}{2048}\)
=> A : 2 = \(\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+....+\frac{1}{2048}+\frac{1}{4096}\)
=> \(\frac{1}{2}\)A = \(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+......+\frac{1}{2048}\)- \(\frac{1}{4}-\frac{1}{8}-\frac{1}{16}-\frac{1}{32}-......-\frac{1}{2048}-\frac{1}{4096}\)
=> A : 2 = \(\frac{1}{2}-\frac{1}{4096}\)
=> A : 2 = \(\frac{2047}{4096}\)
=> A = \(\frac{2047.2}{4096}\)
=> A = \(\frac{4094}{4096}\)
Đặt A = 1/2 + 1/4 + 1/8 + 1/16 + ... + 1/2048
2A = 1 + 1/2 + 1/4 + 1/8 + ... + 1/1024
2A - A = (1 + 1/2 + 1/4 + 1/8 + ... + 1/1024) - (1/2 + 1/4 + 1/8 + 1/16 + ... + 1/2048)
A = 1 - 1/2048
A = 2047/2048
Đặt A = 1/2 + 1/4 + 1/8 + 1/16 + ... + 1/2048
2A = 1 + 1/2 + 1/4 + 1/8 + ... + 1/1024
2A - A = (1 + 1/2 + 1/4 + 1/8 + ... + 1/1024) - (1/2 + 1/4 + 1/8 + 1/16 + ... + 1/2048)
A = 1 - 1/2048
A = 2047/2048
Đã xog, bây h chỉ cần k
tính nhanh 1+2+4+8+16+32+...+1024+2048
Đặt A = 1 + 2 + 4 + ... + 2048
A = 1 + 2 + 22 + ... + 211
2A = 2 + 22 + 23 + ... + 212
2A - A = ( 2 + 22 + 23 + ... + 212 ) - ( 1 + 2 + 22 + ... + 211 )
A = 212 - 1