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- По УРМ1 $$\left|2x+9\right|\le x+18\iff \left\{\begin{array}{l}2x+9\le x+18\\ 2x+9\ge -x-18\end{array}\right.\Rightarrow \left\{\begin{array}{l}x\le 9\\ 3x\ge -27\end{array}\right.\Rightarrow \left\{\begin{array}{l}x\le 9\\ x\ge -9\end{array}\right.\Rightarrow x\in \left[-9;9\right]$$
- Длина данного промежутка равна 18.
- Ответ:
- 18
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