Obliczenie
[tex]53 \frac{3}{5} - 5 \frac{1}{4} = 53 \frac{3 \times 4}{5 \times 4} - 5 \frac{1 \times 5}{4 \times 5} = 53 \frac{12}{20} - 5 \frac{5}{20} = 48 \frac{7}{20} [/tex]
