Penjelasan dengan langkah-langkah:
1)
[tex] = 18\frac{3}{7} - 1 \frac{2}{3} [/tex]
[tex] = \frac{129}{7} - \frac{5}{3} [/tex]
[tex] = \frac{387 - 35}{21} [/tex]
[tex] = \frac{352}{21} [/tex]
[tex] = \bold{16 \frac{16}{21} \: (c)}[/tex]
2)
[tex] = 10 \frac{1}{2} + 8 \frac{2}{3} [/tex]
[tex] = \frac{21}{2} + \frac{26}{3} [/tex]
[tex] = \frac{63 + 52}{6} [/tex]
[tex] = \frac{ 115}{6} [/tex]
[tex] = \bold{19 \frac{1}{6} \: (d)}[/tex]
3)
[tex] = 6 \frac{1}{5} \times 5 \frac{3}{4} [/tex]
[tex] = \frac{31}{5} \times \frac{23}{4} [/tex]
[tex] = \frac{713}{20} [/tex]
[tex] = \bold{35 \frac{13}{20} \: (d) }[/tex]
4)
[tex] = 28 \frac{9}{10} \div 8 \frac{1}{2} [/tex]
[tex] = \frac{289}{10} \div \frac{17}{2} [/tex]
[tex] = \frac{ \cancel{289}^{ \: 17} }{10} \times \frac{2}{ \cancel{17}^{1} } [/tex]
[tex] = \frac{34}{10} [/tex]
[tex] = 3 \frac{4}{10} [/tex]
[tex] = \bold{3 \frac{2}{5} \: (a)}[/tex]
5)
= 39,5 + 15,378
= 39,5 + 15 + 0,378
= 54,5 + 0,378
= 54,878 (B)
