a = 1/2+1/4+1/8+1/16

= (1 - 1/2) + (1/2 -1/4) + (1/4 - 1/8) + ... + (1/512 - 1/1024).

= 1 - 1/1024

= 1023/1024

A=1/2+1/4+1/8+1/16

A=1/2+(1/2-1/4)+(1/4-1/8)+(1/8-1/16)+....+(1/512-1/1024)

=1/2+1/2-1/1024

=1-1/1024=1023/1024

DS : 1023/1024

a = 1/2 + 1/4 + 1/8 + 1/16

= ( 1 - 1/2 ) + ( 1/2 - 1/4 ) + ( 1/4 - 1/8)  + ... + ( 1/512 - 1/1024 )

= 1 - 1/1024

= 1023/1024

a=1/2+1/4+1/8+1/16+...+1/1024

=1023/1024

\(\frac{1023}{1024}\)

MÃi mãi có một tương lai tươi sáng

a= 1023 / 1024

1/4+1/8+1/16+...

=1/4+1/8+1/16+1/32+1/64+1/128+1/256+1/512+1/1024+1/2048

=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+1/512-1/1024+1/1024-1/2048

=1/2-1/2048

=1024/2048-1/2048

=1023/2048

2a=\(1+\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}+\frac{1}{64}+\frac{1}{128}+\frac{1}{256}+\frac{1}{512}\)

2a-a=\(1-\frac{1}{1024}\)

a=\(1-\frac{1}{1024}\)

a=\(\frac{1023}{1024}\)

a= 1023/1024 

**** mik nha bn !!!

ghi ca cau tra loi ra xong minh tich cho nhe ban

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

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

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

A*2-A=511/512+1/1024

A=1023/1024

a)Ngày 1 bán là:\(500.\frac{3}{10}=150\) (kg)

  Ngày 2 bán là:(500-150).20%=70(kg)

  Ngày 3 bán là:\(70:\frac{7}{8}=80\) (kg)

b)Tỉ số của....là:\(\frac{\left[500-\left(150+80+70\right)\right].100}{500}\%=40\%\)

30/91 nha bạn nếu đúng cho mình