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Автор - 1234563819

ПОМОГИТЕ ПОЖАЛУЙСТА!!

Ответ

Автор - QDominus

 frac{1 - 4a}{4}  div frac{28a -  7}{7a}  =  frac{1 - 4a}{4}  times  frac{7a}{7(4a - 1)}  =  \  =  -  frac{4a - 1}{4}  times  frac{a}{4a - 1}  =  -  frac{a}{4}

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