Ответ(ы) на вопрос:
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а) 8 - 3 6/7 = 5 - 6/7 = 4 1/7
или можно перевести в неправильные дроби :
[latex]8 - 3 \frac{6}{7} = \frac{8*7}{7} - \frac{3*7+6}{7} = \frac{56-27}{7} = \frac{29}{7} = 4 \frac{1}{7} [/latex]
б) 2 1/8 + 3 5/12 = 2 3/24 + 3 10/24 = 5 13/24
или
[latex]2 \frac{1}{8} + 3 \frac{5}{12} = \frac{2*8+1}{8} + \frac{3*12+5}{12} = \frac{17}{8} + \frac{41}{12} = \\ \\ = \frac{17*3 }{8*3} + \frac{41*2}{12*2} = \frac{51+82}{24} = \frac{133}{24} = 5 \frac{13}{24} [/latex]
в) 5 13/15 + 1 7/12 = 5 52/60 + 1 35/60 = 6 + 87/60 =
= 6 + 29/20 = 6 + 1 9/20 = 7 9/20
или
[latex]5 \frac{13}{15} + 1 \frac{7}{12} = \frac{5*15+13}{15} + \frac{1*12+7}{12} = \frac{88}{15} + \frac{19}{12} = \\ \\ = \frac{352+95}{60} = \frac{447}{60} = 7 \frac{27}{60} = 7 \frac{9}{20} [/latex]
г) 7 3/8 - 3 5/6 = 7 9/24 - 3 20/24 = 4 9/24 - 20/24 =
= 3 + (33-20)/24 = 3 13/24
или
[latex]7 \frac{3}{8} - 3 \frac{5}{6} = \frac{7*8+3}{8} - \frac{3*6+5}{6} = \frac{59}{8} - \frac{23}{6} = \frac{59*3}{8*3} - \frac{23*4}{6*4} = \\ \\ = \frac{177-92}{24} = \frac{85}{24} = 3 \frac{13}{24} [/latex]
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