\[\boxed{\text{738.}\text{\ }\text{еуроки}\text{-}\text{ответы}\text{\ }\text{на}\text{\ }\text{пятёрку}}\]
\[Уравнение\ имеет\ \]
\[единственный\ корень\ \]
\[при\ D = 0\]
\[\textbf{а)}\ 3x^{2} + tx + 3 = 0\] \[D = t^{2} - 36 = 0\] \[t_{2} = 36\] \[t = \pm 6\] |
\[\textbf{б)}\ 2x^{2} - tx + 50 = 0\] \[D = t^{2} - 400 = 0\] \[t^{2} = 400\] \[t = \pm 20\] |
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\[\textbf{в)}\ tx^{2} - 6x + 1 = 0\] \[D = 36 - 4t = 0\] \[4t = 36\] \[t = 9\] |
\[\textbf{г)}\ tx^{2} + x - 2 = 0\] \[D = 1 + 8t = 0\] \[8t = - 1\] \[t = - \frac{1}{8}\ \] |