Question

Tính tổng M=\(3\dfrac{1}{417}\times\dfrac{1}{762}-\dfrac{1}{139}\times4\dfrac{761}{762}-\dfrac{4}{417\times762}+\dfrac{5}{139}\)

Answer 1

\(M=\left(\dfrac{1252}{417.762}-\dfrac{4}{417.762}\right)-\left(\dfrac{1}{139}+\dfrac{5}{139}\right).\dfrac{3809}{762}\)

\(M=\left(\dfrac{1252-4}{317754}\right)-\dfrac{6}{139}.\dfrac{3809}{762}\)

\(M=\left(\dfrac{1248}{317754}\right)-\dfrac{22854}{105918}\)

\(M=\dfrac{208}{52959}-\dfrac{3809}{17653}\)

\(M=\dfrac{3671824}{934885227}-\dfrac{201720831}{934885227}\)

\(M=\dfrac{-198049007}{934885227}\)