Question

zup mk nha

Answer 1

Answer 2

a,

\(\left(\dfrac{-2}{3}+\dfrac{3}{7}\right):\dfrac{4}{5}+\left(-\dfrac{1}{3}+\dfrac{4}{7}\right):\dfrac{4}{5}\)

\(=\left(\dfrac{-2}{3}+\dfrac{-1}{3}+\dfrac{3}{7}+\dfrac{4}{7}\right):\dfrac{4}{5}\)

\(=\left(-1+1\right):\dfrac{4}{5}=0\)

b,

Answer 3

(\(\dfrac{-2}{3}\)+\(\dfrac{3}{7}\)):\(\dfrac{4}{5}\)+(\(\dfrac{1}{3}\)+\(\dfrac{4}{7}\)):\(\dfrac{4}{5}\)

=(\(\dfrac{-2}{3}\)+\(\dfrac{-1}{3}\)+\(\dfrac{3}{7}\)+\(\dfrac{4}{7}\)):\(\dfrac{4}{5}\)

=(\(\dfrac{-3}{3}\)+\(\dfrac{7}{7}\)):\(\dfrac{4}{5}\)

=(\(-1+1\)):\(\dfrac{4}{5}\)

=0:\(\dfrac{4}{5}\)

=0