\[\boxed{\text{751.}\text{\ }\text{еуроки}\text{-}\text{ответы}\text{\ }\text{на}\text{\ }\text{пятёрку}}\]
\[\textbf{а)}\ a^{2} + 7a + 6 = a + 1\] \[a^{2} + 6a + 5 = 0\] \[D = 36 - 20 = 16\] \[a_{1,2} = \frac{- 6 \pm 4}{2} = - 1;\ - 5\] \[Ответ:при\ a = \left\{ - 1;\ - 5 \right\}.\] |
\[\textbf{б)}\ 3x^{2} - x + 1 = 2x^{2} + 5x - 4\] \[x^{2} - 6x + 5 = 0\] \[D = 36 - 20 = 16\] \[x_{1,2} = \frac{6 \pm 4}{2} = 5;1\] \[Ответ:x = \left\{ 1;5 \right\}\text{.\ }\] |
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