[tex] \frac{a - 1}{ {a}^{2} + 1 } \\ a = - 2 \\ \frac{ - 2 - 1}{ {( - 2)}^{2} + 1} = \frac{ - 3}{4 + 1} = \frac{ - 3}{5} = - \frac{3}{5} [/tex]
Ответ: в) - 0.6
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[tex] \frac{a - 1}{ {a}^{2} + 1 } \\ a = - 2 \\ \frac{ - 2 - 1}{ {( - 2)}^{2} + 1} = \frac{ - 3}{4 + 1} = \frac{ - 3}{5} = - \frac{3}{5} [/tex]
Ответ: в) - 0.6