[tex]i) | - \frac{7}{18} | - \frac{5}{12} = \frac{7}{18} - \frac{5}{12} = \frac{7 \times 2}{18 \times 2} - \frac{5 \times 3}{12 \times 3} = \frac{14}{36} - \frac{15}{36} = \frac{14 - 15}{36} = - \frac{1}{36} [/tex]
[tex]j) | - \frac{29}{14} | - | - \frac{16}{21} | = \frac{29}{14} - \frac{16}{21} = \frac{29 \times 3}{14 \times 3} - \frac{16 \times 2}{21 \times 2} = \frac{87}{42} - \frac{32}{42} = \frac{87 - 32}{42} = \frac{55}{42} [/tex]
[tex]k) \frac{11}{18} - | - \frac{7}{24} | = \frac{11}{18} - \frac{7}{24} = \frac{11 \times 4}{18 \times 4} - \frac{7 \times 3}{24 \times 3} = \frac{44}{72} - \frac{21}{72} = \frac{44 - 21}{72} = \frac{23}{72} [/tex]
[tex]l) \frac{5}{24} - | - \frac{13}{36} | = \frac{5}{24} - \frac{13}{36} = \frac{5 \times 3}{24 \times 3} - \frac{13 \times 2}{36 \times 2} = \frac{15}{72} - \frac{26}{72} = \frac{15 - 26}{72} = - \frac{11}{72} [/tex]
