20 БАЛЛОВ! Найдите значение выражения
[tex] \frac{6}{2a- a^{2} } - \frac{3}{a} [/tex] при а= - 4
[tex] \frac{6}{2a- a^{2} } - \frac{3}{a} [/tex] при а= - 4
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6/(2a - a²) - 3/a = [6 - 3*(2 - a)] / (2a - a²) = (6 - 6 + 3a) / [a*(2 - a)] =
= 3a / [a*(2 - a)] = 3/(2 - a)
a = - 4
3/(2 + 4) = 3/6 = 1/2