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

=226/7

**** mình nha

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

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

= 18 ( 19/21 + 8/9)

= 18.113/63

=226/7 

\(18\left(\frac{19191919}{21212121}+\frac{88888}{99999}\right)\)
\(=18\left(\frac{19}{21}+\frac{8}{9}\right)\)
\(=18\left(\frac{57}{63}+\frac{56}{63}\right)\)
\(=18\left(\frac{113}{63}\right)\)
\(=\frac{3^2.2.113}{3^2.7}\)
\(=\frac{226}{7}\)

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

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

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

266/7

18 x ( \(\frac{19}{21}\)+ \(\frac{8}{9}\)) = 18 x \(\frac{35}{21}\)= 30

= 18 x \(\left(\frac{19.1010101}{21.1010101}+\frac{8.11111}{9.11111}\right)\)= 18 x ( \(\frac{19}{21}+\frac{8}{9}\)) = 9 x 2 ( \(\frac{57+56}{63}\))

= 9 x 2 x \(\frac{113}{63}\)=\(\frac{226}{7}\)

dũng làm chẳng  hiểu gì cả

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

sao khong có kết quả hả bạn

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

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

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

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

55555

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