Question

Помогите желательно расписать

Answer 1

Ответ:

$x_{1} + 2x_{2} + 3x_{3} = 1 \\ 2x_{1} - x_{2} + 3x_{3} = 6 \\ x_{1} + x_{2} + 5x_{3} = - 1 \\ \\ \\ x_{1} + 2x_{2} + 3x_{3} = 1 \\ 2x_{1} - x_{2} + 3x_{3} = 6 \\ x_{1} = - 1 - x_{2} - 5x_{3} \\ \\ \\ - 1 - x_{2} - 5x_{3} + 2x_{2} + 3x_{3} = 1 \\ 2(- 1 - x_{2} - 5x_{3}) - x_{2} + 3x_{3} = 6 \\ \\ \\ x_{2} - 2x_{3} = 2 \\ - 3x_{2} - 7x_{3} = 8 \\ \\ \\ 3x_{2} - 6x_{3} = 6 \\ - 3x_{2} - 7x_{3} = 8 \\ \\ \\ - 13x_{3} = 14 \\ \\ x_{3} = - \frac{14}{13} \\ \\x_{2} - 2x_{3} = 2 \\ x_{2} - 2 \times ( - \frac{14}{13}) = 2 \\ x_{2} + \frac{28}{13} = 2 \\ x_{2} = - \frac{2}{13} \\ \\ \\ x_{1} = - 1 - x_{2} - 5x_{3} \\ x_{1} = - 1 - ( - \frac{2}{13}) - 5 \times ( - \frac{14}{13} ) \\ x_{1} = - 1 + \frac{2}{13} + \frac{70}{13} = \frac{59}{13}$

$x_{1} = \frac{59}{13} \: \: \: \: \: \: \: \: x_{2} = - \frac{2}{13} \: \: \: \: \: \: \: \: \: x_{3} = - \frac{14}{13}$