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а)![frac{(4a-5c)(4a+5c)}{c(a+c)}* frac{-3c}{-(5c-4a)} + frac{13a+14c}{a+c}= frac{-3(4a+5c)}{a+c}+ frac{13a+14c}{a+c} frac{(4a-5c)(4a+5c)}{c(a+c)}* frac{-3c}{-(5c-4a)} + frac{13a+14c}{a+c}= frac{-3(4a+5c)}{a+c}+ frac{13a+14c}{a+c}](https://tex.z-dn.net/?f=+frac%7B%284a-5c%29%284a%2B5c%29%7D%7Bc%28a%2Bc%29%7D%2A+frac%7B-3c%7D%7B-%285c-4a%29%7D+%2B+frac%7B13a%2B14c%7D%7Ba%2Bc%7D%3D+frac%7B-3%284a%2B5c%29%7D%7Ba%2Bc%7D%2B+frac%7B13a%2B14c%7D%7Ba%2Bc%7D+)
![frac{-12a-15c+13a+14c}{a+c}= frac{a-c}{a+c} frac{-12a-15c+13a+14c}{a+c}= frac{a-c}{a+c}](https://tex.z-dn.net/?f=+frac%7B-12a-15c%2B13a%2B14c%7D%7Ba%2Bc%7D%3D+frac%7Ba-c%7D%7Ba%2Bc%7D++)
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