tolong kerjakan ya plis nmr 1 dan 2 pakai cara ya

[tex]1. \: 5 \frac{1}{4} + 2 \frac{1}{2} - 1 \frac{3}{4} \\ = \frac{21}{4} + \frac{5}{2} - \frac{7}{4} \\ = \frac{21 + 10 - 7}{4} \\ = \frac{24}{4} \\ = 6m \\ 2. \: 17 \frac{1}{2} - 6 \frac{1}{4} + 9 \frac{3}{4} \\ = \frac{35}{2} - \frac{25}{4} + \frac{39}{4} \\ = \frac{70 - 25 + 39}{4} \\ = \frac{84}{4} \\ = 21kg[/tex]

semoga membantu ;) ;)