12 per 3per4 + 78per 1 per 2+ 56 per 5 per6

[tex] \frac{12}{\frac{3}{4}}[/tex] + [tex] \frac{78}{\frac{1}{2}}[/tex] + [tex] \frac{56}{\frac{5}{6}}[/tex]

→ (12 x [tex] \frac{4}{3}[/tex]) + (78 x [tex] \frac{2}{1}[/tex]) + (56 x [tex] \frac{6}{5}[/tex])
= 16 + 156 + (56 x [tex] \frac{6}{5}[/tex])
= 172 + ([tex] \frac{336}{5}[/tex])

Kita jadikan desimal saja, maka
→ 172 + [tex] \frac{336x2}{5x2}[/tex]
= 172 + [tex] \frac{672}{10}[/tex]
= 172 + 67,2
= 239,2