\(\dfrac{-5}{12}+\dfrac{4}{3}-\dfrac{1}{2}\)
\(=\dfrac{-5}{12}+\dfrac{16}{12}-\dfrac{6}{12}\)
\(=\dfrac{-5+16-6}{12}\)
\(=\dfrac{11-6}{12}\)
\(=\dfrac{5}{12}\)
\(---\)
\(\dfrac{-15}{8}:\dfrac{5}{4}-\dfrac{1}{2}\)
\(=\dfrac{-15}{8}\cdot\dfrac{4}{5}-\dfrac{1}{2}\)
\(=\dfrac{-3}{2}-\dfrac{1}{2}\)
\(=\dfrac{-4}{2}\)
\(=-2\)
\(---\)
\(1+\dfrac{-14}{5}:\dfrac{7}{2}-\left(-\dfrac{1}{5}\right)\)
\(=1+\dfrac{-14}{5}\cdot\dfrac{2}{7}+\dfrac{1}{5}\)
\(=\dfrac{5}{5}-\dfrac{4}{5}+\dfrac{1}{5}\)
\(=\dfrac{1}{5}+\dfrac{1}{5}\)
\(=\dfrac{2}{5}\)
\(Toru\)
Đúng 4
Bình luận (0)
