Question

Tính:

\(\dfrac{2}{5}+\left(-\dfrac{4}{3}\right)+\left(-\dfrac{1}{2}\right)\)

Answer 1

-43/30

Answer 2

\(\dfrac{2}{5}+\left(-\dfrac{4}{3}\right)+\left(-\dfrac{1}{2}\right)\)

\(=\dfrac{2}{5}-\dfrac{4}{3}-\dfrac{1}{2}\)

\(=\dfrac{6}{15}-\dfrac{20}{15}-\dfrac{1}{2}\)

\(=\dfrac{-14}{15}-\dfrac{1}{2}\)

\(=\dfrac{-28}{30}-\dfrac{15}{30}\)

\(=\dfrac{-43}{30}\)

Answer 3

\(\dfrac{2}{5}+\left(\dfrac{-4}{3}\right)+\left(-\dfrac{1}{2}\right)\)

\(=\dfrac{12}{30}-\dfrac{40}{30}-\dfrac{15}{30}\)

\(=-\dfrac{28}{30}-\dfrac{15}{30}\)

\(=\dfrac{-43}{30}\)