Question

Thực hiện phép tính

\(\dfrac{-7}{12}+\dfrac{11}{20}-\dfrac{8}{15}\)

\(\left(0.7-\dfrac{1}{5}\right):\dfrac{5}{2^3}\)

Answer 1

\(\dfrac{-7}{12}+\dfrac{11}{20}-\dfrac{8}{15}\)

=\(\dfrac{-35}{60}+\dfrac{33}{60}-\dfrac{32}{60}\)

=\(\dfrac{-17}{30}\)

\(\left(0.7-\dfrac{1}{5}\right):\dfrac{5}{2^3}\)

=\(\left(\dfrac{7}{10}-\dfrac{1}{5}\right):\dfrac{5}{8}\)

=\(\dfrac{1}{2}:\dfrac{5}{8}\)= \(\dfrac{4}{5}\)

Answer 2

-7/12+11/20-8/15

=-35/60+33/60-8/15

=-2/60-8/15

=-2/60-32/60

=-34/60=-17/30

(0.7-1/5):5/2^3

=(7/10-1/5):5/8

=(7/10-2/10):5/8

=5/10:5/8

=5/10*8/5

=8/10=4/5