Question

[Trần Phan Minh Huyền]

Tính tổng S = 1/2+1/4+1/8+.......+1/256+1/512

Answer 1

[Lê Thủy Vân]

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 .

Answer 2

[Carthrine]

1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128 + 1/256 + 1/512 + 1/1024 

Ta có : 
1/512 = 1×2 / 512×2 = 2/1024 

1/256 = 1×4 / 256×4 = 4/1024 

1/128 = 1×8 / 128×8 = 8/1024 

1/64 = 1×16 / 64×16 = 16/1024 

1/32 = 1×32 / 32×32 = 32/1024 

1/16 = 1×64 / 16×64 = 64/1024 

1/8 = 1×128 / 8×128 = 128/1024 

1/4 = 1×256 / 4×256 = 256/1024 

1/2 = 1×512 / 2×512 = 512/1024 
___________________________ 

=> 
1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128 + 1/256 + 1/512 + 1/1024 

= 512/1024 + 256/1024 + 128/1024 + 64/1024 + 32/1024 + 16/1024 + 8/1024 + 4/1024 + 2/1024 + 1/1024 

= (512 + 256 + 128 + 64 + 32 + 16 + 8 + 4 + 2 + 1) / 1024 

= 1023/1024