Đáp án:
$M=\dfrac{25}{9}$
Giải thích các bước giải:
$M=(\dfrac{6}{5}+\dfrac{4}{5}).\dfrac{5}{9}+(\dfrac{4}{5}+\dfrac{11}{5}).\dfrac{5}{9}$
$M=\dfrac{5}{9}.(\dfrac{6}{5}+\dfrac{4}{5}+\dfrac{4}{5}+\dfrac{11}{5})$
$M=\dfrac{5}{9}.\dfrac{6+4+4+11}{5}$
$M=\dfrac{5}{9}.\dfrac{25}{5}$
$M=\dfrac{25}{9}$