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А)6/8+1/4=6/8+2/8=1 Б)12/6-1/7=84/42-6/42=78/42=13/7=1 6/7 В)3/3-12/13=13/13-12/13=1/13 Г)4/3-11/11=4/3-3/3=1/3

[latex]1. ( \frac{7}{8} - \frac{1}{8} )+ \frac{1}{4} =1 \\ \\ 1) \frac{7}{8} - \frac{1}{8} = \frac{6}{8} = \frac{3}{4} \\ 2) \frac{3}{4} + \frac{1}{4} = \frac{3+1}{4} = \frac{4}{4} =1[/latex] [latex]2. ( \frac{7}{3} - \frac{4}{3} ) - \frac{12}{13} = 1 - \frac{12}{13} = \frac{13-12}{13} = \frac{1}{13} [/latex] [latex]3. ( \frac{5}{6} + \frac{7}{6} )- \frac{1}{7} =1 \frac{6}{7} \\ \\ 1) \frac{5+7}{6} = \frac{12}{6} =2 \\ 2) 2- \frac{1}{7} = 1 + \frac{7-1}{7} = 1 \frac{6}{7} [/latex] [latex]4. \frac{4}{3} - (\frac{9}{11} + \frac{2}{11} ) = \frac{1}{3} \\ \\ 1) \frac{9+2}{11} = \frac{11}{11} =1 \\ 2) \frac{4}{3} -1= \frac{4}{3} - \frac{3}{3} = \frac{4-3}{3} = \frac{1}{3} [/latex]