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[tex]a] \ 6\frac{8}{9}-\frac{2}{3}=6\frac{8}{9}-\frac{6}{9}=6\frac{2}{9}\\\\b] \ 6\frac{1}{4}-\frac{5}{8}=6\frac{2}{8}-\frac{5}{8}=5\frac{10}{8}-\frac{5}{8}=5\frac{5}{8}\\\\c] \ 1\frac{1}{2}-\frac{6}{7}=1\frac{7}{14}-\frac{12}{14}=\frac{21}{14}-\frac{12}{14}=\frac{9}{14}\\\\d] \ 7\frac{3}{4}-4\frac{5}{6}=7\frac{9}{12}-4\frac{10}{12}=6\frac{21}{12}-4\frac{10}{12}=2\frac{11}{12}[/tex]
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