Question

Giup toi voi

Answer 1

\(=\dfrac{-4}{15}-\dfrac{18}{19}-\dfrac{20}{19}-\dfrac{11}{15}=-1-1=-2\)

Answer 2

\(\left(\dfrac{-4}{15}-\dfrac{18}{19}\right)-\left(\dfrac{20}{19}+\dfrac{11}{15}\right)\)

\(=\dfrac{-4}{15}-\dfrac{18}{19}-\dfrac{20}{19}-\dfrac{11}{15}\)

\(=\left(\dfrac{-4}{15}-\dfrac{11}{15}\right)-\left(\dfrac{18}{19}+\dfrac{20}{19}\right)\)

\(=-1-2\)

\(=-3\)

Answer 3

(\(\dfrac{-4}{15}\)-\(\dfrac{18}{19}\))-(\(\dfrac{20}{19}\)+\(\dfrac{11}{15}\))

=\(\dfrac{-4}{15}\)- \(\dfrac{18}{19}\)\(\dfrac{20}{19}\)- \(\dfrac{11}{15}\)

=\(\dfrac{-4}{15}\) -\(\dfrac{11}{15}\) - \(\dfrac{18}{19}\)- \(\dfrac{20}{19}\) 

=\(\dfrac{-15}{15}\)-\(\dfrac{-38}{19}\)

=-1 -2

=-3