Question

Thực hiện phép tính:

( \(\dfrac{3}{8}+\dfrac{-3}{4}+\dfrac{7}{12}\)).\(\dfrac{5}{6}+\dfrac{1}{2}\)

b) 1\(\dfrac{13}{15}.0,75-\left(\dfrac{11}{20}+25\%\right):\dfrac{7}{5}\)

Answer 1

tick di to lam cho

Answer 2

a, \(\left(\dfrac{3}{8}+\dfrac{-3}{4}+\dfrac{7}{12}\right)\dfrac{5}{6}+\dfrac{1}{2}\)

\(=\left(\dfrac{-3}{8}+\dfrac{7}{12}\right)\dfrac{5}{6}+\dfrac{1}{2}\)

\(=\dfrac{5}{24}.\dfrac{5}{6}+\dfrac{1}{2}\)

\(=\dfrac{25}{144}+\dfrac{1}{2}\)

\(=\dfrac{97}{144}\)

b, \(1\dfrac{13}{15}.0,75-\left(\dfrac{11}{20}+25\%\right):\dfrac{7}{5}\)

\(=\dfrac{28}{15}.0,75-\dfrac{4}{5}:\dfrac{7}{5}\)

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

\(=\dfrac{29}{35}\)