Đáp án:
Giải thích các bước giải:
$\frac{391}{58} +(7\frac{1}{3} - 6\frac{7}{8}) : \frac{3}{4} - (5\frac{1}{4} + 4\frac{21}{40}) : 1\frac{9}{20}$
$= \frac{391}{58} +(\frac{22}{3} - \frac{55}{8}) : \frac{3}{4} - (\frac{21}{4} + \frac{181}{40}) : \frac{29}{20}$
$= \frac{391}{58} +(\frac{176}{24} - \frac{165}{24}) : \frac{3}{4} - (\frac{210}{40} + \frac{181}{40}) : \frac{29}{20}$
$=\frac{391}{58} +\frac{11}{24} × \frac{4}{3} - \frac{391}{40} × \frac{20}{29}$
$=\frac{391}{58} +\frac{11}{18} - \frac{391}{58} = \frac{11}{18}$
