Question

ai nhanh mình tick nhé

1/2 + 1/4 + 1/8 + 1/16+ 1/32 + 1/64 + 1/128

Answer 1

1/2 + 1/4 + 1/8 + 1/16+ 1/32 + 1/64 + 1/128 

= 64/ 128 + 32/128 + 16/128 +8/128 + 4/128 +2/128 + 1/128

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

= 127/ 128

Answer 2

= 1 - 1/2 + 1/2 - 1/4 + 1/4 - ............ + 1/64 - 1/128

= 1 - 1/128 

= 127/128

k nha bn

Answer 3

Đặt A= 1/2+1/4+1/8+1/16+1/32+1/64+1/128

     2A=1+1/2+1/4+1/8+1/16+1/32+1/64

     2A-A=(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)

     A=1-1/128=127/128
 

Answer 4

Đặt A= 1/2+1/4+1/8+1/16+1/32+1/64+1/128

Khi đó ta có: 2A=1+1/2+1/4+1/8+1/16+1/32+1/64

 =>             2A-A=(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)

=>                   A=1-1/128

=>                   A = 127/128 

Answer 5

\(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}+\frac{1}{64}+\frac{1}{128}=\frac{64}{128}+\frac{32}{128}+\frac{16}{128}+\frac{ }{ }\)\(+\frac{8}{128}+\frac{4}{128}+\frac{2}{128}+\frac{1}{128}\)\(=\frac{127}{128}\)

Answer 6

1/2+1/4+1/8+1/16+1/32+1/64+1/128=127/128

k nha

Answer 7

1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128

= 1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128

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   1/2 +  1/4 + 1/8 + 1/16 + 1/32 +1/64 +1/128                                          ( Đấy là rút gọn cho nhanh đấy nhé không phải là gạch bỏ đâu )

= 1 - 1/128

= 127/128

Answer 8

127/128

Answer 9

127/128, bài này hơi khó