1/2 + 1/4+ 1/8+ 1/16 + 1/32 + 1/64 + 1/128 + 1/256 + 1/512
= 1 – 1/2 + 1/2- 1/4 + 1/4 – 1/8 + 1/8 – 1/16 + 1/16 – 1/32 + 1/32 – 1/64 + 1/64 – 1/128 + 1/128 – 1/256 – 1/256 – 1/512
= 1 – 1/512
= 511/512 .
Tính nhanh :
1/2+1/4+1/8+1/16+1/32+1/64
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 
tính nhanh : 1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64
tính nhanh:1/2+1/4+1/8+1/16+1/32 +1/64
Tính nhanh : 1+1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256+1/512
tính nhanh: 1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64
Rút gọn phân số 5083/2431
Tính nhanh :
1/2+1/4+1/8+1/16+1/32+1/64+1/128
Tính nhanh
1/2 + 1/4 + 1/8 + 1/16 +1/32 + 1/64 + 1/128
Tính nhanh:
1/2+1/4+1/8+1/16+1/32+1/64+1/128
