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
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
1/2+1/4+1/8+...+1/1024+1/2048+1/4096
1/2+1/4+1/8+....+1/1024+1/2048+1/4096=?
Cho A =1+1/2+1/4+1/8+.............+1/2048+1/4096+1/8192
Tính nhanh :
A = 3/1x5 + 3/5x9 + 3/9x3 + ...... 3/97x101 + 3/101x105
B = 1/5 + 1/25 + 1/125 + 1/625 + 1/3125 + 1/15625
C = 1 + 2 + 4 + 8 + 16 +... + 2048 + 4096
Soyeon_ Tiểu bàng giải giúp mình nhé
1/2 + 1/4 + 1/8 +.....+ 1024 + 2048 + 4096= ?
( Ai nhanh nhất mà đúng cho tick)
tính tổng sau:
1/2 + 1/4 + 1/8 + 1/16 ..... + 1/2048
1-1/2-1/4-1/8-1/16-1/32-...-1/1024-1/2048
tính nhanh
1/2+1/4+1/6+1/8+1/16+ +1/2048 hãy tính tổng ?
1/2+1/4+1/8+1/16+..........................+1/2048