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1)
![7 frac{2}{3} + 1 = 8 frac{2}{3} 7 frac{2}{3} + 1 = 8 frac{2}{3}](https://tex.z-dn.net/?f=7+frac%7B2%7D%7B3%7D+%2B+1+%3D+8+frac%7B2%7D%7B3%7D+)
2)
![frac{8}{15} + 0 = frac{8}{15} frac{8}{15} + 0 = frac{8}{15}](https://tex.z-dn.net/?f=+frac%7B8%7D%7B15%7D+%2B+0+%3D+frac%7B8%7D%7B15%7D+)
3)
![( - frac{6}{8} ) + frac{6}{8} = 0 ( - frac{6}{8} ) + frac{6}{8} = 0](https://tex.z-dn.net/?f=%28+-+frac%7B6%7D%7B8%7D+%29+%2B+frac%7B6%7D%7B8%7D+%3D+0)
4)
![frac{7}{10} + frac{7}{8} = frac{28}{40} + frac{35}{40} = frac{63}{40} = 1 frac{23}{40} frac{7}{10} + frac{7}{8} = frac{28}{40} + frac{35}{40} = frac{63}{40} = 1 frac{23}{40}](https://tex.z-dn.net/?f=+frac%7B7%7D%7B10%7D+%2B+frac%7B7%7D%7B8%7D+%3D+frac%7B28%7D%7B40%7D+%2B+frac%7B35%7D%7B40%7D+%3D+frac%7B63%7D%7B40%7D+%3D+1+frac%7B23%7D%7B40%7D+)
5)
![7 frac{2}{10} - 2 frac{5}{10} = 4 frac{7}{10} 7 frac{2}{10} - 2 frac{5}{10} = 4 frac{7}{10}](https://tex.z-dn.net/?f=7+frac%7B2%7D%7B10%7D+-+2+frac%7B5%7D%7B10%7D+%3D+4+frac%7B7%7D%7B10%7D+)
6)
![- frac{1}{4} + frac{3}{4} = frac{3}{4} - frac{1}{4} = frac{2}{4} = frac{1}{2} - frac{1}{4} + frac{3}{4} = frac{3}{4} - frac{1}{4} = frac{2}{4} = frac{1}{2}](https://tex.z-dn.net/?f=+-+frac%7B1%7D%7B4%7D+%2B+frac%7B3%7D%7B4%7D+%3D+frac%7B3%7D%7B4%7D+-+frac%7B1%7D%7B4%7D+%3D+frac%7B2%7D%7B4%7D+%3D+frac%7B1%7D%7B2%7D+)
7)
![7 frac{5}{6} + 6 frac{7}{15} = 13 + ( frac{5}{6} + frac{7}{15} ) = 13 + ( frac{25}{30} + frac{14}{30} ) = 13 + frac{39}{30} = 13 + 1 frac{9}{30} = 14 frac{9}{30} = 14 frac{3}{10} 7 frac{5}{6} + 6 frac{7}{15} = 13 + ( frac{5}{6} + frac{7}{15} ) = 13 + ( frac{25}{30} + frac{14}{30} ) = 13 + frac{39}{30} = 13 + 1 frac{9}{30} = 14 frac{9}{30} = 14 frac{3}{10}](https://tex.z-dn.net/?f=7+frac%7B5%7D%7B6%7D+%2B+6+frac%7B7%7D%7B15%7D+%3D+13+%2B+%28+frac%7B5%7D%7B6%7D+%2B+frac%7B7%7D%7B15%7D+%29+%3D+13+%2B+%28+frac%7B25%7D%7B30%7D+%2B+frac%7B14%7D%7B30%7D+%29+%3D+13+%2B+frac%7B39%7D%7B30%7D+%3D+13+%2B+1+frac%7B9%7D%7B30%7D+%3D+14+frac%7B9%7D%7B30%7D+%3D+14+frac%7B3%7D%7B10%7D+)
8)
![- frac{1}{3} + 1 = 1 - frac{1}{3} = frac{3}{3} - frac{1}{3} = frac{2}{3} - frac{1}{3} + 1 = 1 - frac{1}{3} = frac{3}{3} - frac{1}{3} = frac{2}{3}](https://tex.z-dn.net/?f=+-+frac%7B1%7D%7B3%7D+%2B+1+%3D+1+-+frac%7B1%7D%7B3%7D+%3D+frac%7B3%7D%7B3%7D+-+frac%7B1%7D%7B3%7D+%3D+frac%7B2%7D%7B3%7D+)
9)
![frac{2}{3} + frac{3}{5} = frac{10}{15} + frac{9}{15} = frac{10 + 9}{15} = frac{19}{15} = 1 frac{4}{15} frac{2}{3} + frac{3}{5} = frac{10}{15} + frac{9}{15} = frac{10 + 9}{15} = frac{19}{15} = 1 frac{4}{15}](https://tex.z-dn.net/?f=+frac%7B2%7D%7B3%7D+%2B+frac%7B3%7D%7B5%7D+%3D+frac%7B10%7D%7B15%7D+%2B+frac%7B9%7D%7B15%7D+%3D+frac%7B10+%2B+9%7D%7B15%7D+%3D+frac%7B19%7D%7B15%7D+%3D+1+frac%7B4%7D%7B15%7D+)
![frac{3}{8} + frac{1}{6} + frac{7}{8} - frac{1}{3} = frac{9}{24} + frac{4}{24} + frac{21}{24} - frac{8}{24} = frac{9 + 4 + 21 - 8}{24} = frac{26}{24} = 1 frac{2}{24} = 1 frac{1}{12} frac{3}{8} + frac{1}{6} + frac{7}{8} - frac{1}{3} = frac{9}{24} + frac{4}{24} + frac{21}{24} - frac{8}{24} = frac{9 + 4 + 21 - 8}{24} = frac{26}{24} = 1 frac{2}{24} = 1 frac{1}{12}](https://tex.z-dn.net/?f=+frac%7B3%7D%7B8%7D+%2B+frac%7B1%7D%7B6%7D+%2B+frac%7B7%7D%7B8%7D+-+frac%7B1%7D%7B3%7D+%3D+frac%7B9%7D%7B24%7D+%2B+frac%7B4%7D%7B24%7D+%2B+frac%7B21%7D%7B24%7D+-+frac%7B8%7D%7B24%7D+%3D+frac%7B9+%2B+4+%2B+21+-+8%7D%7B24%7D+%3D+frac%7B26%7D%7B24%7D+%3D+1+frac%7B2%7D%7B24%7D+%3D+1+frac%7B1%7D%7B12%7D+)
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