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Question

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Answer 1

A) (x+1/x)^2=9
  x^2 +2*x*(1/x) +1/x^2=9
x^2+2+1/x^2=9
x^2+1/x^2=9-2; x^2+1/x^2=7
б) x^2+1/x^2=t^2-2; 
 в)(x- 1/x)^2=5^2
    (x^2-2*x*(1/x) +1/x^2=25
x^2+1/x^2=25+2=27
г)x^2 +1/x^2=t^2+2

Answer 2

Г) x - 1/x = t
t² = x² - 2 + 1/x²
x² + 1/x² = t² + 2

Comments

в пункте Б аналогично, только ответ будет t**2-2