[tex][tex]x = - 3.1[/tex]
1 — B
[tex]1 \: \: \: \: \: \frac{2}{x + 3} + \frac{x}{2x + 6} = \frac{2}{x + 3} + \frac{x}{2(x + 3)} = \frac{4 + x}{2(x + 3)} = \frac{4 + ( - 3.1)}{2(( - 3.1) + 3)} = \frac{4 - 3.1}{2 \times ( - 0.1)} = \frac{0.9}{ - 0.2} = - 4.5[/tex]
2 — А
[tex]2 \: \: \: \: \: x - \frac{ {x}^{2} }{x + 3} = \frac{x(x + 3) - {x}^{2} }{x + 3} = \frac{ {x}^{2} + 3x - {x}^{2} }{x + 3} = \frac{3x}{x + 3} = \frac{3 \times ( - 3.1)}{ - 3.1 + 3} = \frac{ - 9.3}{ - 0.1} = 93[/tex]
3 — Г
[tex]3 \: \: \: \: \: \frac{4x + 1}{ {x}^{2} - 9} + \frac{3x + 4}{9 - {x}^{2} } = \frac{4 \times ( - 3.1) + 1}{ {( - 3.1)}^{2} - 9 } + \frac{3 \times ( - 3.1) + 4}{9 - {( - 3.1)}^{2} } = \frac{ - 12.4 + 1}{9.61 - 9} + \frac{ - 9.3 + 4}{9 - 9.61} = \frac{ - 11.4}{0.61} + \frac{ - 5.3}{ - 0.61} = \frac{11.4 - 5.3}{ - 0.61} = \frac{6.1}{ - 0.61} = - 10[/tex][/tex]
Ответ:
Объяснение: см. решение в файле ниже.
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Answers & Comments
[tex][tex]x = - 3.1[/tex]
1 — B
[tex]1 \: \: \: \: \: \frac{2}{x + 3} + \frac{x}{2x + 6} = \frac{2}{x + 3} + \frac{x}{2(x + 3)} = \frac{4 + x}{2(x + 3)} = \frac{4 + ( - 3.1)}{2(( - 3.1) + 3)} = \frac{4 - 3.1}{2 \times ( - 0.1)} = \frac{0.9}{ - 0.2} = - 4.5[/tex]
2 — А
[tex]2 \: \: \: \: \: x - \frac{ {x}^{2} }{x + 3} = \frac{x(x + 3) - {x}^{2} }{x + 3} = \frac{ {x}^{2} + 3x - {x}^{2} }{x + 3} = \frac{3x}{x + 3} = \frac{3 \times ( - 3.1)}{ - 3.1 + 3} = \frac{ - 9.3}{ - 0.1} = 93[/tex]
3 — Г
[tex]3 \: \: \: \: \: \frac{4x + 1}{ {x}^{2} - 9} + \frac{3x + 4}{9 - {x}^{2} } = \frac{4 \times ( - 3.1) + 1}{ {( - 3.1)}^{2} - 9 } + \frac{3 \times ( - 3.1) + 4}{9 - {( - 3.1)}^{2} } = \frac{ - 12.4 + 1}{9.61 - 9} + \frac{ - 9.3 + 4}{9 - 9.61} = \frac{ - 11.4}{0.61} + \frac{ - 5.3}{ - 0.61} = \frac{11.4 - 5.3}{ - 0.61} = \frac{6.1}{ - 0.61} = - 10[/tex][/tex]
Ответ:
Объяснение: см. решение в файле ниже.