Вычислите по действиям:(3/5-1/7)-(13/15-1/2)-1/21
(25/28-5/14)-(5/7-1/4)-1/28
(35/36-5/8)-(17/18-7/9)-5/72
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Ответы
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1.![( \frac{3}{5} - \frac{1}{7} )-( \frac{13}{15}- \frac{1}{2})- \frac{1}{21} = \frac{16}{35} - \frac{11}{30} - \frac{1}{21}= \frac{96-77-10}{210} =\frac{9}{210} = \frac{3}{70} ( \frac{3}{5} - \frac{1}{7} )-( \frac{13}{15}- \frac{1}{2})- \frac{1}{21} = \frac{16}{35} - \frac{11}{30} - \frac{1}{21}= \frac{96-77-10}{210} =\frac{9}{210} = \frac{3}{70}](https://tex.z-dn.net/?f=%28+%5Cfrac%7B3%7D%7B5%7D+-+%5Cfrac%7B1%7D%7B7%7D+%29-%28+%5Cfrac%7B13%7D%7B15%7D-+%5Cfrac%7B1%7D%7B2%7D%29-+%5Cfrac%7B1%7D%7B21%7D+%3D+%5Cfrac%7B16%7D%7B35%7D+-+%5Cfrac%7B11%7D%7B30%7D+-+%5Cfrac%7B1%7D%7B21%7D%3D+%5Cfrac%7B96-77-10%7D%7B210%7D+%3D%5Cfrac%7B9%7D%7B210%7D+%3D+%5Cfrac%7B3%7D%7B70%7D+)
2.![(\frac{25}{28}-\frac{5}{14})-(\frac{5}{7}-\frac{1}{4})- \frac{1}{28} =\frac{15}{28}-\frac{13}{28}-\frac{1}{28}=\frac{1}{28} (\frac{25}{28}-\frac{5}{14})-(\frac{5}{7}-\frac{1}{4})- \frac{1}{28} =\frac{15}{28}-\frac{13}{28}-\frac{1}{28}=\frac{1}{28}](https://tex.z-dn.net/?f=%28%5Cfrac%7B25%7D%7B28%7D-%5Cfrac%7B5%7D%7B14%7D%29-%28%5Cfrac%7B5%7D%7B7%7D-%5Cfrac%7B1%7D%7B4%7D%29-+%5Cfrac%7B1%7D%7B28%7D+%3D%5Cfrac%7B15%7D%7B28%7D-%5Cfrac%7B13%7D%7B28%7D-%5Cfrac%7B1%7D%7B28%7D%3D%5Cfrac%7B1%7D%7B28%7D)
3.![(\frac{35}{36}-\frac{5}{8})-(\frac{17}{18}-\frac{7}{9})- \frac{5}{72} =\frac{25}{72}-\frac{3}{18}-\frac{5}{72}=\frac{8}{72}= \frac{1}{9} (\frac{35}{36}-\frac{5}{8})-(\frac{17}{18}-\frac{7}{9})- \frac{5}{72} =\frac{25}{72}-\frac{3}{18}-\frac{5}{72}=\frac{8}{72}= \frac{1}{9}](https://tex.z-dn.net/?f=%28%5Cfrac%7B35%7D%7B36%7D-%5Cfrac%7B5%7D%7B8%7D%29-%28%5Cfrac%7B17%7D%7B18%7D-%5Cfrac%7B7%7D%7B9%7D%29-+%5Cfrac%7B5%7D%7B72%7D+%3D%5Cfrac%7B25%7D%7B72%7D-%5Cfrac%7B3%7D%7B18%7D-%5Cfrac%7B5%7D%7B72%7D%3D%5Cfrac%7B8%7D%7B72%7D%3D+%5Cfrac%7B1%7D%7B9%7D+)
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