b:3=1/2+1/4+1/8+1/16+1/32+1/64+1/128
[b:3]x2=1+1/2+1/4+1/8+1/16+1/32+1/64
[b:3]x2-[b:3]=1+1/2+1/4+1/8+1/16+1/32+1/64-1/2+1/4+1/8+1/16+1/32+1/64+1/128
b:3=1-1/128
b:3=127/128
b=127/128x3
b=381/128
k giúp mình nhé
tính nhanh phân số: B=3/2+3/4+3/8+3/16+3/32+3/64+3/128
Tính nhanh :
B=3/2 + 3/4 +3/8 +3/16 +3/32 +3/64 +3/128
a,1+5/4+5/8+5/16+5/32+5/64
b,3/2+3/8+3/32+3/128+3/512
c,3+3/5+3/25+3/125+3/625
ai giải được mình cho 5nine luon
tính nhanh p/s 1+ 5/4 + 5/8 + 5/16 + 5/32 + 5/64
b) 1/3 +1/9 + 1/27 + 1/81 +...........+ 1/59049
c) 3/2 + 3/8 + 3/32 +3/128 + 3/512
d) 1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128 + 1/256 giúp mình với 
1. Tính nhanh tổng sau :
3/2 + 3/4 + 3/8 + 3/16 + 3/32 + 3/64 + 3/128 + 3/256 + 3/512 + 3/1024
tính nhanh tổng sau3/2+3/4+3/8+3/16+3/32+3/64+3/128+3/256+3/512
GIÚP MÌNH NHÁ
BÀI TÍNH NHANH
A.2/3+2/6+2/12+2/24+2/48+2/96+2/192
B.1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256
C.1/3+1/9+1/27+1/81+1/243+1/729
D.3/2+3/8+3/32+3/128+3/512
E.3+3/5+3/25+3/125+3/625
Tính bằng cách nhanh nhất:
a.\(\dfrac{3}{4}+\dfrac{3}{8}+\dfrac{3}{16}+\dfrac{3}{32}+\dfrac{3}{64}+\dfrac{3}{128}+\dfrac{3}{256}\)
b. Tính tổng của 100 số lẻ liên tiếp đầu tiên.
Ghi rõ cách làm
1 + 5/4 + 5/8 + 5/16 + 5/32 + 5/64
3 + 3/5 + 3/25 + 3/125 + 3/512
