[Toán 6] Phân số

V

vanmanh2001

$a) 17\dfrac{29}{31} - 9\dfrac{7}{8} - 12\dfrac{28}{31} + 4$
$= \dfrac{29}{31}-\dfrac{7}{8} - \dfrac{28}{31}$
$= \dfrac{1}{31} - \dfrac{7}{8}$
$= \dfrac{-209}{48}$
$b)\dfrac{\dfrac{7}{12} + \dfrac{10}{12} - 1}{5 - \dfrac{9}{12} + \dfrac{4}{12}}$
$= \dfrac{\dfrac{5}{12}}{\dfrac{55}{12}}$
$= \dfrac{5}{55} = \dfrac{1}{11}$
 
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