\(\dfrac{14}{9}\) x \(\dfrac{11}{8}-\dfrac{3}{8}\) x \(\dfrac{14}{9}\)

\(=\dfrac{14}{9}\) x \(\left(\dfrac{11}{8}-\dfrac{3}{8}\right)\)

\(=\dfrac{14}{9}\) x \(\dfrac{8}{8}=\dfrac{14}{9}\) x \(1\)

\(=\dfrac{14}{9}\)

oa cảm ơn bạn nhé :3

14/9 × 11/8 - 3/8 × 14/9 

= 14/9 × ( 11/8 - 3/8 ) 

= 14/9 × 8/8 

= 14/9 - 1 

= 5/9

`9/14+19/18+19/14+35/18`

`=(9/14+19/14)+(19/18+35/18)`

`=28/14+54/18`

`=2+3`

`=5`

\(\dfrac{3}{7}\cdot\dfrac{9}{26}-\dfrac{1}{14}\cdot\dfrac{1}{13}\)

\(=\dfrac{3\cdot9-1}{14\cdot13}=\dfrac{26}{14\cdot13}=\dfrac{2}{14}=\dfrac{1}{7}\)

`4/6+7/13+17/9+19/13+1/9+14/6`

`=(4/6+14/6)+(7/13+19/13)+(17/9+1/9)`

`=18/6+26/13+18/9`

`=3+2+2`

`=7`

'

Bạn viết lại đề, (1 và 2/25 + .....)

Bạn sửa phần in đậm.

(\(1\dfrac{2}{25}\) + \(\dfrac{14}{9}\) + \(\dfrac{17}{5}\)) - (\(\dfrac{2}{25}\) + \(\dfrac{5}{9}\) + 40%)

= \(1\dfrac{2}{25}\) + \(\dfrac{14}{9}\) + \(\dfrac{17}{5}\) - \(\dfrac{2}{25}\) - \(\dfrac{5}{9}\) - 40%

= \(1\dfrac{2}{25}\) + \(\dfrac{14}{9}\) + \(\dfrac{17}{5}\) - \(\dfrac{2}{25}\) - \(\dfrac{5}{9}\) - \(\dfrac{2}{5}\)

= (\(1\dfrac{2}{25}\)  - \(\dfrac{2}{25}\) ) + (\(\dfrac{14}{9}\) - \(\dfrac{5}{9}\)) + (\(\dfrac{17}{5}\) - \(\dfrac{2}{5}\) ) 

=           1         +       1       +       3

=                                5

\(=\left(\dfrac{3}{8}+\dfrac{5}{14}\right)+\dfrac{26}{11}=\dfrac{1907}{616}\)

=9/24+26/11+5/14

=1907/616

\(\frac{14}{9}:\frac{13}{12}+\frac{4}{3}:\frac{13}{12}\)

\(=\frac{14}{9}\cdot\frac{12}{13}+\frac{4}{3}\cdot\frac{12}{13}\)

\(=\left(\frac{14}{9}+\frac{4}{3}\right)\cdot\frac{12}{13}\)

\(=\frac{26}{9}\cdot\frac{12}{13}=\frac{8}{3}\)