Clarifying the task
I think I need to clarify what the user wants me to solve from the image since it includes tasks numbered 40 and 41. I should ask a straightforward question like, "Which task should I solve: #40, #41, or both?" since I can't just guess what they mean. The user requested a brief answer and steps, but I can't provide that until I have confirmation on what to address. It seems like asking is the best route!Responding in Russian
I need to reply in Russian since that's what the user expects. I can say, "На фото два задания — №40 и №41. Какое решить: только №40, только №41 или оба?" This gives them a clear and concise question without adding any extra information. It's all about making sure I get the clarification
Краткий ответ:
а) \(\angle 1=104^\circ\);
б) \(\angle 1=140^\circ\);
в) \(\angle 1=72^\circ\);
г) \(\angle 1=105^\circ\).
Решение
Так как углы \(1\) и \(2\) смежные, их сумма равна \(180^\circ\):
\[ \angle 1+\angle 2=180^\circ. \]
Обозначим \(\angle 1=x\), \(\angle 2=y\).
а)
\[ x-y=28,\qquad x+y=180. \]
Складываем уравнения:
\[ 2x=208,\qquad x=104^\circ. \]
б)
\[ x:y=7:2. \]
Пусть \(x=7k,\ y=2k\). Тогда:
\[ 7k+2k=180,\quad 9k=180,\quad k=20. \]
\[ x=7\cdot20=140^\circ. \]
в)
\[ x=\frac23y. \]
Значит, углы относятся как \(2:3\). Всего \(5\) частей:
\[ 1\text{ часть}=\frac{180^\circ}{5}=36^\circ. \]
\[ x=2\cdot36^\circ=72^\circ. \]
г)
\[ 5x-7y=0 \quad\Rightarrow\quad 5x=7y. \]
Следовательно,
\[ x:y=7:5. \]
Всего \(12\) частей:
\[ 1\text{ часть}=\frac{180^\circ}{12}=15^\circ. \]
\[ x=7\cdot15^\circ=105^\circ. \]
Проверка: во всех случаях второй угол вместе с найденным даёт \(180^\circ\).