1/а-2-4a/a^2-4*(1/a-1-1/a^2-a)
1/a-2-4a/a^2-4-4/a+4+4-4/a^2+4a= -6/a*a=-6a^2
Вроде так)
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1/a-2-4a/a^2-4-4/a+4+4-4/a^2+4a= -6/a*a=-6a^2
Вроде так)