Уравнение x²+4x-3 = 0 имеет корни x₁ и х₂
[tex]\frac{1}{x_{1} } + \frac{1}{x_{2} }[/tex]
[tex]x_{1 }{^2} * x_{2} + x_{2 }{^2} * x_{1}[/tex]
[tex]x_{1 }^{2} + x_{2} ^{2} =[/tex]
[tex](x_{1} - x_{2} )^{2} =[/tex]
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