Предмет: Алгебра, автор: nikch2007

помогите, даю 25 баллов

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Автор ответа: NNNLLL54
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Ответ:

a=-7,93\\\\\dfrac{a+3}{a^3-4a}\cdot \dfrac{a^2+4a+4}{a+12}:\dfrac{2+a}{a^2-2a}=\\\\\\=\dfrac{a+3}{a(a-2)(a+2)}\cdot \dfrac{(a+2)^2}{a+12}\cdot \dfrac{a(a-2)}{a+2}=\dfrac{a+3}{a+12}=\dfrac{-7,93+3}{-7,93+12}=\dfrac{-4,93}{4,07}=\\\\\\=-\dfrac{493}{407}=-1\dfrac{86}{407}

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