Question

(-4/5 + 2/3) + (-5/4 + 14/5) + (7/3 - 2) Tính nhanh ạ (em trên điện thoại k gõ đc)

Answer 1

    ( - \(\dfrac{4}{5}\) + \(\dfrac{2}{3}\)) + ( - \(\dfrac{5}{4}\) + \(\dfrac{14}{5}\) ) + ( \(\dfrac{7}{3}\) - 2)

= - \(\dfrac{4}{5}\) + \(\dfrac{2}{3}\)  - \(\dfrac{5}{4}\) + \(\dfrac{14}{5}\) + \(\dfrac{7}{3}\) - 2

=  (  \(\dfrac{14}{5}\) - \(\dfrac{4}{5}\)) + ( \(\dfrac{2}{3}\) + \(\dfrac{7}{3}\)) - \(\dfrac{5}{4}\) - 2

= \(\) 2 + 3 - \(\dfrac{5}{4}\) - 2

= ( 2 - 2) + ( 3 - \(\dfrac{5}{4}\))

= \(\dfrac{7}{4}\)