х2-2х-3 = 0
Д = 4+12 = 16
х(1) = (2+4) / 2 = 3
х(2) = (2-4) /2 = -1
Ответ: {-1; 3}⊂{1;-1; 2; 3}
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х2-2х-3 = 0
Д = 4+12 = 16
х(1) = (2+4) / 2 = 3
х(2) = (2-4) /2 = -1
Ответ: {-1; 3}⊂{1;-1; 2; 3}