hasil dari 20 1per 2-11 3 per 4

[tex]20 \frac{1}{2} - 11 \frac{3}{4} \\ = (20 - 11) + ( \frac{1}{2} - \frac{3}{4}) \\ = 9 + ( \frac{4 - 6}{8} ) \\ = 9 + ( \frac{ - 2}{8} ) \\ = \frac{72 - 2}{8} \\ = \frac{70}{8} \\ = 8 \frac{3}{4} [/tex]