Question

Answer 1

`(-3)/7 . 15/13 -3/7 . 11/13 - 3/7`

`=-3/7 . 15/13 + (-3/7) . 11/13 + (-3/7) . 1`

`=-3/7 .(15/13 +11/13+1)`

`=-3/7 . (15/13+11/13+13/13)`

`=-3/7. 39/13`

`=-3/7 . 3`

`=-9/7`

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`1 13/15 . 0,75 - (11/20 + 25%) : 7/5`

`=28/15 . 3/4 - (11/20 + 1/4) : 7/5`

`=28/15 . 3/4 -(11/20 + 5/20) : 7/5`

`=28/15 . 3/4 - 4/5 : 7/5`

`=28/15 . 3/4 - 4/5 . 5/7`

`=7/5 - 4/7`

`=49/35 - 20/35`

`=29/35`

Answer 2

e: \(=\dfrac{-3}{7}\left(\dfrac{15}{13}+\dfrac{11}{13}+1\right)=-\dfrac{3}{7}\cdot3=-\dfrac{9}{7}\)

f: \(=\dfrac{28}{15}\cdot\dfrac{3}{4}-\left(\dfrac{11}{20}+\dfrac{5}{20}\right)\cdot\dfrac{5}{7}\)

\(=\dfrac{7}{5}-\dfrac{4}{7}=\dfrac{29}{35}\)