a,

\(=\frac{1+2+3+4+5+6+7+8+9}{10}=\frac{45}{10}=\frac{9}{2}\)

b,\(=9\times\left(\frac{26\times10101}{27\times10101}+\frac{8\times11111}{9\times11111}\right)=9\times\left(\frac{26}{27}+\frac{8}{9}\right)=9\times\frac{50}{27}=\frac{50}{3}\)

k cho mk nha!!!!!!!!!!!!!

Mk cần gấp các bạn ơi !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!?

\(=1+1+0,2+5+6+7+8+9+11+11,988\)

\(=60,188\)

=1+1+0,2+6+7+8+9+11+11,988

=55,188

Ta có: 15x14-1/15x13+14=15x13+15-1/15x13+14=15x13+14/15x13+14=1 

\(\frac{15x14-1}{15x13+14}\)

\(\frac{15x13}{15x13+14}\)=\(\frac{1}{14}\)

\(\frac{9}{8}>\frac{8}{9}\)

\(\frac{16}{23}>\frac{16}{25}\)

\(\frac{8}{11}< \frac{8}{10}\)

\(\frac{10}{13}>\frac{19}{26}\)

\(\frac{13}{15}< \frac{11}{10}\)

\(\frac{11}{9}=\frac{44}{36}\)

9/8 > 8/9 

16/23 > 16/25 

8/11 < 8/10 

10/13 > 19/26 

13/15 < 11/10 

11/9 = 44/36 

Tham khảo nha !

Chúc bạn học giỏi !

Haha

cuoi lol

\(\frac{5}{6}:\frac{8}{9}-\frac{3}{4}:\frac{8}{9}\)

\(=\left(\frac{5}{6}-\frac{3}{4}\right):\frac{8}{9}\)

\(=\frac{1}{12}:\frac{8}{9}\)

\(=\frac{1}{12}\times\frac{9}{8}\)

\(=\frac{3}{32}\)

(\(\frac{5}{6}\)-\(\frac{3}{4}\)) : \(\frac{8}{9}\)

=\(\frac{1}{12}\): \(\frac{8}{9}\)

=\(\frac{3}{32}\)

k nhé, sau đó kb lun!

x/88+3=4+999/333

x/88+4=4+3

x/88+4=7

x/88    =7-4

x/88     =3

x          =3x88

x          =264 

\(\frac{7}{8}\)x \(\frac{8}{9}\)x \(\frac{9}{10}\)

= \(\frac{7}{9}\)x  \(\frac{9}{10}\)

= \(\frac{7}{10}\)

1 x \(\frac{2}{3}\): \(\frac{4}{3}\) : \(\frac{5}{4}\)

= \(\frac{2}{3}\)x \(\frac{3}{4}\)x \(\frac{4}{5}\)

= \(\frac{1}{2}\) x \(\frac{4}{5}\)

= \(\frac{2}{5}\)

\(\frac{7}{8}\times\frac{8}{9}\times\frac{9}{10}\)

\(=\frac{7\times8\times9}{8\times9\times10}\)

\(=\frac{7}{10}\)

\(1\times\frac{2}{3}:\frac{4}{3}:\frac{5}{4}\)

\(=\frac{2}{3}\times\frac{3}{4}\times\frac{4}{5}\)

\(=\frac{2}{5}\)