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Задание: Вычислите значение выражения.
1)![- \frac{1}{4} + \frac{3}{5} = - \frac{5*1}{5*4} + \frac{4*3}{4*5} = - \frac{5}{20} + \frac{12}{20} = \frac{7}{20} - \frac{1}{4} + \frac{3}{5} = - \frac{5*1}{5*4} + \frac{4*3}{4*5} = - \frac{5}{20} + \frac{12}{20} = \frac{7}{20}](https://tex.z-dn.net/?f=+-+%5Cfrac%7B1%7D%7B4%7D+%2B++%5Cfrac%7B3%7D%7B5%7D+%3D++-+%5Cfrac%7B5%2A1%7D%7B5%2A4%7D+%2B+%5Cfrac%7B4%2A3%7D%7B4%2A5%7D+%3D++-+%5Cfrac%7B5%7D%7B20%7D+%2B++%5Cfrac%7B12%7D%7B20%7D+%3D+%5Cfrac%7B7%7D%7B20%7D+)
2)![\frac{9}{11} + (- \frac{2}{5} ) = \frac{5*9}{5*11} - \frac{11*2}{11*5} = \frac{45}{55} - \frac{22}{55} = \frac{23}{55} \frac{9}{11} + (- \frac{2}{5} ) = \frac{5*9}{5*11} - \frac{11*2}{11*5} = \frac{45}{55} - \frac{22}{55} = \frac{23}{55}](https://tex.z-dn.net/?f=+%5Cfrac%7B9%7D%7B11%7D+%2B+%28-+%5Cfrac%7B2%7D%7B5%7D+%29+%3D++%5Cfrac%7B5%2A9%7D%7B5%2A11%7D+-+%5Cfrac%7B11%2A2%7D%7B11%2A5%7D+%3D++%5Cfrac%7B45%7D%7B55%7D+-++%5Cfrac%7B22%7D%7B55%7D+%3D++%5Cfrac%7B23%7D%7B55%7D+)
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4)![- 8\frac{9}{14} + 3 \frac{3}{7} = - \frac{121}{14} + \frac{24}{7} = - \frac{121}{14} + \frac{2*24}{2*14} = - \frac{121}{14} + \frac{48}{14} = - \frac{73}{14} = - 5 \frac{3}{14} - 8\frac{9}{14} + 3 \frac{3}{7} = - \frac{121}{14} + \frac{24}{7} = - \frac{121}{14} + \frac{2*24}{2*14} = - \frac{121}{14} + \frac{48}{14} = - \frac{73}{14} = - 5 \frac{3}{14}](https://tex.z-dn.net/?f=-++8%5Cfrac%7B9%7D%7B14%7D+%2B+3+%5Cfrac%7B3%7D%7B7%7D+%3D++-+%5Cfrac%7B121%7D%7B14%7D+%2B+%5Cfrac%7B24%7D%7B7%7D+%3D+-+%5Cfrac%7B121%7D%7B14%7D+%2B++%5Cfrac%7B2%2A24%7D%7B2%2A14%7D+%3D+-++%5Cfrac%7B121%7D%7B14%7D++%2B++%5Cfrac%7B48%7D%7B14%7D+%3D+-++%5Cfrac%7B73%7D%7B14%7D+%3D+-+5+%5Cfrac%7B3%7D%7B14%7D+)
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