Пусть x1 и x2 - корни квадратного трехчлена x2 - 9x +1.
Найдите значение выражения f(x1; x2):

а)
[tex]f(x1.x2) = x1 { }^{2} + x2 {}^{2} [/tex]

б)
[tex] f(x1.x2) = x1 - \frac{x1 {}^{2} }{x1 + x2} [/tex]
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