Question

помогите пожалуйста ​

Answer 1

$\displaystyle\bf\\1)\\\\\frac{3}{7} -\frac{2}{6} =\frac{3}{7} -\frac{1}{3} =\frac{3\cdot 3-1\cdot 7}{7\cdot 3} =\frac{9-7}{21} =\frac{2}{21} \\\\2)\\\\\frac{4}{11} -\frac{1}{22} =\frac{4}{11} -\frac{1}{11\cdot 2} =\frac{4\cdot 2-1}{22} =\frac{8-1}{22} =\frac{7}{22} \\\\3)\\\\\frac{2}{12} -\frac{1}{6} =\frac{1}{6} -\frac{1}{6} =0$