4. Уравнение х^2 +рх +5=0 имеет корни х1 и х2. Выразите через коэффициент р сумму:

а) 1/х1 + 1/х2 ;   б) х1^2 + x2^2;  в) х1/х2 + х2/х1;  г) х1^3 + x2^3

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