Упростите выражение: а) 12 х^5/55: 6х^2/5 б) х-у/4а * 4/х-у в) 5 а^2/а^2-16: 5а/а+4. Created by olganik1976. algebra-ru

а+4...

Dasulya21 A) $\frac{12x ^{5} }{55} : \frac{6 x^{2} }{5}= \frac{12 x^{5} }{55} * \frac{5}{6 x^{2} } = \frac{2 x^{3} }{11}$
б) $\frac{x-y}{4a}* \frac{4}{x-y} = \frac{1}{a}$
в) $\frac{5 a^{2} }{ a^{2}-16 } : \frac{5a}{a+4} = \frac{5 a^{2} }{(a-4)(+4)}* \frac{a+4}{5a}= \frac{a}{a-4}$

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