Đáp án:
\(M = \dfrac{5}{{211}}\)
Giải thích các bước giải:
\(\begin{array}{l}
M = \left( {2 + \dfrac{1}{{547}}} \right).\dfrac{3}{{211}} - \dfrac{{546}}{{547}}.\dfrac{1}{{211}} - \dfrac{4}{{547}}.\dfrac{1}{{211}}\\
= \dfrac{1}{{211}}.\left[ {\left( {2 + \dfrac{1}{{547}}} \right).3 - \dfrac{{546}}{{547}} - \dfrac{4}{{547}}} \right]\\
= \dfrac{1}{{211}}.\left( {\dfrac{{1095.3}}{{547}} - \dfrac{{550}}{{547}}} \right)\\
= \dfrac{1}{{211}}.\dfrac{{2735}}{{547}} = \dfrac{1}{{211}}.5 = \dfrac{5}{{211}}
\end{array}\)
