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Resolver.
![\frac{7}{20} + \frac{3}{40} + \frac{1}{80} + \frac{3}{15} \frac{7}{20} + \frac{3}{40} + \frac{1}{80} + \frac{3}{15}](https://tex.z-dn.net/?f=+%5Cfrac%7B7%7D%7B20%7D+%2B++%5Cfrac%7B3%7D%7B40%7D+%2B++%5Cfrac%7B1%7D%7B80%7D+%2B++%5Cfrac%7B3%7D%7B15%7D)
![\frac{7*4}{20*4} + \frac{3*2}{40*2} + \frac{1}{80} + \frac{3}{15} \frac{7*4}{20*4} + \frac{3*2}{40*2} + \frac{1}{80} + \frac{3}{15}](https://tex.z-dn.net/?f=+%5Cfrac%7B7%2A4%7D%7B20%2A4%7D+%2B+%5Cfrac%7B3%2A2%7D%7B40%2A2%7D+%2B+%5Cfrac%7B1%7D%7B80%7D+%2B+%5Cfrac%7B3%7D%7B15%7D)
![\frac{28}{80} + \frac{6}{80} + \frac{1}{80} + \frac{3}{15} \frac{28}{80} + \frac{6}{80} + \frac{1}{80} + \frac{3}{15}](https://tex.z-dn.net/?f=+%5Cfrac%7B28%7D%7B80%7D+%2B+%5Cfrac%7B6%7D%7B80%7D+%2B+%5Cfrac%7B1%7D%7B80%7D+%2B+%5Cfrac%7B3%7D%7B15%7D)
![\frac{28+6+1}{20}+ \frac{3}{15} \frac{28+6+1}{20}+ \frac{3}{15}](https://tex.z-dn.net/?f=+%5Cfrac%7B28%2B6%2B1%7D%7B20%7D%2B+%5Cfrac%7B3%7D%7B15%7D)
![\frac{35}{20} + \frac{3}{15} \frac{35}{20} + \frac{3}{15}](https://tex.z-dn.net/?f=+%5Cfrac%7B35%7D%7B20%7D+%2B++%5Cfrac%7B3%7D%7B15%7D)
![\frac{(35)(15)+(20)(3)}{20*15} \frac{(35)(15)+(20)(3)}{20*15}](https://tex.z-dn.net/?f=+%5Cfrac%7B%2835%29%2815%29%2B%2820%29%283%29%7D%7B20%2A15%7D+)
![\frac{525+60}{300} \frac{525+60}{300}](https://tex.z-dn.net/?f=+%5Cfrac%7B525%2B60%7D%7B300%7D+)
![\frac{585:5}{300:5} \frac{585:5}{300:5}](https://tex.z-dn.net/?f=+%5Cfrac%7B585%3A5%7D%7B300%3A5%7D+)
}
![\frac{39}{20} \frac{39}{20}](https://tex.z-dn.net/?f=+%5Cfrac%7B39%7D%7B20%7D+)
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