\(=18x\frac{19x1010101}{21x1010101}+\frac{8x11111}{9x11111}=18x\frac{19}{21}+\frac{8}{9}\)

sao khong có kết quả hả bạn

\(18\cdot\left(\frac{19191919}{21212121}+\frac{88888}{99999}\right)\)

\(=18\cdot\left(\frac{19}{21}+\frac{8}{9}\right)\)

\(=18\cdot\frac{113}{63}\)

\(=\frac{678}{21}\approx32,286\)

= 18 ( 19/21 + 8/9)

= 18.113/63

=226/7 

55555

\(=18\times\left(\frac{19}{21}+\frac{8}{9}\right)=18\times\frac{113}{63}=\frac{226}{7}\)

=226/7

**** mình nha

\(18.\left(\frac{19191919}{21212121}+\frac{88888}{99999}\right)=18.\left(\frac{19}{21}+\frac{8}{9}\right)=18.\frac{113}{63}=\frac{226}{7}nha!!!!!\)

\(\frac{226}{7}\)

Câu a:Đáp số 127/128

Câu b:Đáp số 1021/63

a) Đặt A= 1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128 + 1/256 
2A= 2(1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128 + 1/256) 
     = 1+1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128 
=>A =  2A-A =1+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 - 1/256 
=1-1/256 
=255/256

b) = 18 - (19/21 + 8/9) = 18 - 113/63 = 1021/63

a) Đặt A= 1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128 + 1/256 
2A= 2(1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128 + 1/256) 
     = 1+1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128 
=>A =  2A-A =1+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 - 1/256 
=1-1/256 
=255/256

b) sai đề

18 x ( 19 x 1010101 / 21 x 1010101 + 8 x 11111/ 9x 11111)

= 18 x ( 19/21 + 8/9 )

= 18 x 19 / 21 + 18 x 8/9

= 6x3x19/7x3 + 9x2x8/9 = 6x19/7 + 16

= 226/7

1, 2006 x 2005 - 1/2004 x 2006 + 2005 = 4411,202002

2,18 x (19191919/21212121 + 88888/99999) = 3,91015873

k mk nha pạn

mk nhanh nhất