Question

-7 phần 8 : 21 phần 16 - 5 phần 3 nhân ( 1 phần 5 - 7 phần 10 )

Answer 1

ai giúp mình với

Answer 2

\(\dfrac{-7}{8}:\dfrac{21}{16}-\dfrac{5}{3}.\left(\dfrac{1}{5}-\dfrac{7}{10}\right)\)

\(=\dfrac{-7}{8}.\dfrac{16}{21}-\dfrac{5}{3}.\left(\dfrac{-1}{2}\right)\)

\(=\dfrac{-2}{3}+\dfrac{5}{6}=\dfrac{1}{6}\)

Answer 3

\(=\dfrac{-7}{8}:\dfrac{21}{16}-\dfrac{5}{3}.\left(\dfrac{1}{5}-\dfrac{7}{10}\right)\\ =\dfrac{-7}{8}.\dfrac{16}{21}-\dfrac{5}{3}.\dfrac{-1}{2}\\ =\dfrac{2}{3}-\dfrac{-5}{6}=\dfrac{3}{2}\)