Answer:
1.
[tex]\frac{5}{6}-\frac{1}{2}\\=\frac{5}{6}-(\frac{1}{2}\times\frac{3}{3})\\=\frac{5}{6}-\frac{3}{6}\\=\frac{2}{6}\\=\boxed{\frac{1}{3}}[/tex]
2.
[tex]2-1\frac{3}{7}\\=2-\frac{10}{7}\\=(2\times\frac{7}{7})-\frac{10}{7}\\=\frac{14}{7}-\frac{10}{7}\\=\boxed{\frac{4}{7}}[/tex]
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