làm cho tui vs nè ok bye

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1. e)$\frac{4}{11}$ .($\frac{5}{7}$+ $\frac{2}{5}$ )-$\frac{4}{11}$($\frac{-2}{7}$ +$\frac{7}{5}$ )

   =$\frac{4}{11}$ .$\frac{39}{35}$ -$\frac{4}{11}$..$\frac{39}{35}$

   =$\frac{4}{11}$.0

   =0

   f)$\frac{4}{13}$ .$\frac{4}{11}$ +$\frac{4}{13}$ +$\frac{7}{11}$ -$\frac{4}{13}$

   =$\frac{4}{13}$.($\frac{4}{11}$+$\frac{7}{11}$-1)

   =$\frac{4}{13}$.0

   =0

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2. `e, 4/11 . ( 5/7 + 2/5 ) – 4/11 . ( -2/7 + 7/5 )`

   `= 4/11 . ( 5/7 + 2/5 – -2/7 + 7/5 )`

   `= 4/11 . ( 5/7 + 2/5 + 2/7 + 7/5 )`

   `= 4/11 . [ ( 5/7 + 2/7 ) + ( 2/5 + 7/5 ) ]`

   `= 4/11 . ( 1 + 9/5 )`

   `= 4/11 . 14/5`

   `= 56/55`

   `f, 4/13 . 4/11 + 4/13 . 7/11 – 4/13`

   `= 4/13 . ( 4/11 + 7/11 ) – 4/13`

   `= 4/13 . 1 – 4/13`

   `= 4/13 – 4/13`

   `= 0`

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