Уравнение
[tex]x ^{2} + 6x - 7 = 0[/tex]
имеет корни х1 и х2. Не решая уравнение, найдите х1
[tex]x{1} ^{2} + x2 ^{2} [/tex]
и
[tex](x1 - x2) ^{2} [/tex]
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