а²-81/2а²+18а при а=-0.5
(а²-81) / (2а²+18а)= ((а-9)(а+9) / (2а(а+9)) = (а-9)/2а = (-0,5-9)/2*(-0,5) = -9,5/ -1 =
= 9.5
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а²-81/2а²+18а при а=-0.5
(а²-81) / (2а²+18а)= ((а-9)(а+9) / (2а(а+9)) = (а-9)/2а = (-0,5-9)/2*(-0,5) = -9,5/ -1 =
= 9.5