[tex]a) \: 17 - 3 \frac{1}{5} [/tex]
[tex]17-\frac{3\times 5+1}{5}[/tex]
LCM=5
[tex]17-\frac{16}{5}[/tex]
[tex]17\times \frac{5}{5}-\frac{16}{5}[/tex]
[tex]\frac{85}{5}-\frac{16}{5}[/tex]
[tex] \frac{69}{5} [/tex]
[tex]13 \frac{4}{5} [/tex]
[tex]b) \: 2\frac{1}{5}+4\frac{1}{4}+\frac{7}{10}[/tex]
[tex]6+\frac{1}{5}+\frac{1}{4}+\frac{7}{10}[/tex]
LCM=20
[tex]6+\frac{4}{20}+\frac{5}{20}+\frac{14}{20}[/tex]
[tex]6+\frac{4}{20}+\frac{5}{20}+\frac{14}{20}[/tex]
[tex]6+\frac{23}{20}[/tex]
[tex]6+1\frac{3}{20}[/tex]
[tex]7\frac{3}{20}[/tex]
