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341
A..
![- \frac{3}{7} - \frac{4}{9}. ( \frac{5}{6} ) \\ - \frac{3}{7} - \frac{4}{9}. ( \frac{5}{6} ) \\](https://tex.z-dn.net/?f=-+%5Cfrac%7B3%7D%7B7%7D+-+%5Cfrac%7B4%7D%7B9%7D.+%28+%5Cfrac%7B5%7D%7B6%7D+%29+%5C%5C)
![=- \frac{3}{7} - \frac{20}{54} =- \frac{3}{7} - \frac{20}{54}](https://tex.z-dn.net/?f=%3D-+%5Cfrac%7B3%7D%7B7%7D+-+%5Cfrac%7B20%7D%7B54%7D+)
![=- \frac{54(3)-7(20)}{378} =- \frac{54(3)-7(20)}{378}](https://tex.z-dn.net/?f=%3D-+%5Cfrac%7B54%283%29-7%2820%29%7D%7B378%7D+)
![=- \frac{162-140}{378} =- \frac{162-140}{378}](https://tex.z-dn.net/?f=%3D-+%5Cfrac%7B162-140%7D%7B378%7D)
![=- \frac{22}{378} =- \frac{22}{378}](https://tex.z-dn.net/?f=%3D-+%5Cfrac%7B22%7D%7B378%7D+)
![=- \frac{11}{189} =- \frac{11}{189}](https://tex.z-dn.net/?f=%3D-+%5Cfrac%7B11%7D%7B189%7D+)
B..
![\frac{1}{7}: \frac{3}{-2} + \frac{7}{8}
\frac{1}{7}: \frac{3}{-2} + \frac{7}{8}](https://tex.z-dn.net/?f=+%5Cfrac%7B1%7D%7B7%7D%3A+%5Cfrac%7B3%7D%7B-2%7D+%2B+%5Cfrac%7B7%7D%7B8%7D+%0A)
![=- \frac{ \frac{1}{7} }{ \frac{3}{2}} + \frac{7}{8}
=- \frac{ \frac{1}{7} }{ \frac{3}{2}} + \frac{7}{8}](https://tex.z-dn.net/?f=+%3D-+%5Cfrac%7B+%5Cfrac%7B1%7D%7B7%7D+%7D%7B+%5Cfrac%7B3%7D%7B2%7D%7D+%2B+%5Cfrac%7B7%7D%7B8%7D+%0A)
![=-\frac{2}{21} + \frac{7}{8} =-\frac{2}{21} + \frac{7}{8}](https://tex.z-dn.net/?f=+%3D-%5Cfrac%7B2%7D%7B21%7D+%2B+%5Cfrac%7B7%7D%7B8%7D+)
![= \frac{8(-2)+21(7)}{168} = \frac{8(-2)+21(7)}{168}](https://tex.z-dn.net/?f=%3D+%5Cfrac%7B8%28-2%29%2B21%287%29%7D%7B168%7D)
![= \frac{-16+147}{168} = \frac{-16+147}{168}](https://tex.z-dn.net/?f=%3D+%5Cfrac%7B-16%2B147%7D%7B168%7D+)
![= \frac{131}{168} = \frac{131}{168}](https://tex.z-dn.net/?f=%3D+%5Cfrac%7B131%7D%7B168%7D+)
-Espero haberte ayudado, saludos!!!
B..
-Espero haberte ayudado, saludos!!!
melaniherrera09:
full em ayudO arthO grxasi :)
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