Автор - pups7888

номер 1 пожалуйста!!!! буду примного благодарна​

Ответ

Автор - EverIra

Объяснение:

( frac{8a}{a^{2}  - b^{2} }  +  frac{3}{b - a}  -  frac{4}{a  + b} ) div  frac{1}{5a - 5b}  = ( frac{8a}{a^{2}  - b^{2} }   -   frac{3(a + b)}{(a - b)(a + b)}  -  frac{4(a - b)}{(a  + b)(a - b)} ) div  frac{1}{5(a - b)} = ( frac{8a}{a^{2}  - b^{2} }   - frac{3(a + b)}{a^{2}  - b^{2}}  -  frac{4(a - b)}{a^{2}  - b^{2}} ) div  frac{1}{5(a - b)} =  frac{8a - 3a - 3b - 4a + 4b}{a^{2}  - b^{2}}  div  frac{1}{5(a - b)} =  frac{a - b}{a^{2}  - b^{2}}  div frac{1}{5(a - b)} =  frac{1}{5(a^{2}  - b^{2})}

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