Задача 55784 область определения функций...

5f6a06ffb931bd71f10f35dc

24.11.2020 11:11:45

область определения функций

5f3ea7e3faf909182968ddd9

24.11.2020 11:39:15

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[b]11.1.40.[/b]
[m]\left\{\begin{matrix}
y^2-1 ≥0 \\x^2-1 ≥0 \end{matrix}\right.[/m];[m]\left\{\begin{matrix}
y^2 ≥1\\x^2 ≥1 \end{matrix}\right.[/m];[m]\left\{\begin{matrix}
|y| ≥1\\|x| ≥1 \end{matrix}\right.[/m]
[b]11.1.45[/b]
[m]-1 ≤ \frac{x}{y} ≤ 1[/m] ⇒ [m]\left\{\begin{matrix}
\frac{x}{y} ≤ 1\\ \frac{x}{y} ≥-1 \end{matrix}\right.[/m]; [m]\left\{\begin{matrix}
\frac{x}{y}-1 ≤ 0\\ \frac{x}{y} +1≥0 \end{matrix}\right.[/m]; [m]\left\{\begin{matrix}
\frac{x-y}{y} ≤ 0\\ \frac{x+y}{y} ≥0 \end{matrix}\right.[/m];