Bạn tham khảo!
$23\dfrac{1}{4}$ $.$ $\dfrac{7}{5}$ $-$ $13\dfrac{1}{4}$ $:$ $\dfrac{5}{7}$
$=$ $\dfrac{93}{4}$ $.$ $\dfrac{7}{5}$ $-$ $\dfrac{53}{4}$ $.$ $\dfrac{7}{5}$
$=$ $\dfrac{7}{5}$ $.$ $($ $\dfrac{93}{4}$ $-$ $\dfrac{53}{4}$ $)$
$=$ $\dfrac{7}{5}$ $.$ $10$
$=$ $14$
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