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а) 8 - 3 6/7 = 5 - 6/7 = 4 1/7
или можно перевести в неправильные дроби :
![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} 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}](https://tex.z-dn.net/?f=8+++-++++3+++frac%7B6%7D%7B7%7D+%3D++frac%7B8%2A7%7D%7B7%7D++-++frac%7B3%2A7%2B6%7D%7B7%7D+%3D++frac%7B56-27%7D%7B7%7D+%3D++frac%7B29%7D%7B7%7D+%3D+4++frac%7B1%7D%7B7%7D+)
б) 2 1/8 + 3 5/12 = 2 3/24 + 3 10/24 = 5 13/24
или
![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} 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}](https://tex.z-dn.net/?f=2++frac%7B1%7D%7B8%7D++%2B+3+frac%7B5%7D%7B12%7D+%3D++frac%7B2%2A8%2B1%7D%7B8%7D+%2B+frac%7B3%2A12%2B5%7D%7B12%7D+%3D+frac%7B17%7D%7B8%7D+%2B+frac%7B41%7D%7B12%7D+%3D+%5C++%5C+%0A%3D+frac%7B17%2A3+%7D%7B8%2A3%7D++%2B+frac%7B41%2A2%7D%7B12%2A2%7D+%3D+frac%7B51%2B82%7D%7B24%7D+%3D+frac%7B133%7D%7B24%7D+%3D+5+frac%7B13%7D%7B24%7D+)
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
![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} 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}](https://tex.z-dn.net/?f=5++frac%7B13%7D%7B15%7D+++%2B++1++frac%7B7%7D%7B12%7D+%3D++frac%7B5%2A15%2B13%7D%7B15%7D+%2B+frac%7B1%2A12%2B7%7D%7B12%7D+%3D++frac%7B88%7D%7B15%7D+%2B+frac%7B19%7D%7B12%7D+%3D+%5C++%5C+%0A%3D+frac%7B352%2B95%7D%7B60%7D+%3D++frac%7B447%7D%7B60%7D+%3D+7++frac%7B27%7D%7B60%7D+%3D+7++frac%7B9%7D%7B20%7D+)
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
![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} 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}](https://tex.z-dn.net/?f=7+++frac%7B3%7D%7B8%7D+++++-++3+frac%7B5%7D%7B6%7D++%3D++frac%7B7%2A8%2B3%7D%7B8%7D+-++frac%7B3%2A6%2B5%7D%7B6%7D+%3D++frac%7B59%7D%7B8%7D+-+frac%7B23%7D%7B6%7D+%3D++frac%7B59%2A3%7D%7B8%2A3%7D+-+frac%7B23%2A4%7D%7B6%2A4%7D+%3D+%5C++%5C+%0A%3D++frac%7B177-92%7D%7B24%7D+%3D+frac%7B85%7D%7B24%7D+%3D+3++frac%7B13%7D%7B24%7D+)
или можно перевести в неправильные дроби :
б) 2 1/8 + 3 5/12 = 2 3/24 + 3 10/24 = 5 13/24
или
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
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
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