Question

tính nhanh

 C=[\(^{\dfrac{17}{28}}\)+\(\dfrac{18}{29}\)-\(\dfrac{19}{30}\)-\(\dfrac{20}{11}\)].[\(\dfrac{1}{2}\)-\(\dfrac{1}{3}\)-\(\dfrac{1}{6}\)]

Answer 1

Xét: \(\dfrac{1}{2}-\dfrac{1}{3}-\dfrac{1}{6}\)

\(=\dfrac{3-2-1}{6}\)

\(=0\)

\(\rightarrow C=0\)