Ответы на вопрос:
(х+1)/(х^2+х-1) + (х^2+х-1)/(х+1) = 2 (х+1)/(х^2+х-1)=a (х^2+х-1)/(х+1)=1/a a+1/a=2 a^2+1=2a a^2-2a+1=0 (a-1)^2=0 a=1 (х+1)/(х^2+х-1)=1 (x+1-x^2-x+1)/(x^2+x-1)=0 2-x^2=0 x^2=2 x=+-√2
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