Вопрос школьника по предмету Математика
корень(x^2+x+4) + корень (x^2+x+1) = корень (2x^2+2x+9)
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Ответ учителя по предмету Математика
чтобы избавиться от иррациональности,обе части уравнения нужно возвести в квадрат:√(x²+x+4)=4; ⇒x²+x+4=16;⇒x²+x-12=0;x₁₂=-1/2⁺₋√1/4+12=-1/2⁺₋√49/4=-1/2⁺₋7/2;x₁=-1/2+7/2=6/2=3;x₂=-1/2-7/2=-8/2=-4;
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Once an Englishman came to Paris and stopped at a hotel. First of all he sent a telegram to her the address of the hotel, and then decided to see the town. He left the hotel his wife, telling several blocks, and walked along the street. He passed to the right and walked along another street He walked as far as the corner, crossed the street and turned to the left. He liked Paris very much In every street there was something inte He walked a long time, crossed many streets and turned many corners. It was already evening, and he wanted to go back. And only now he ized that he had lost his way. not remember the name of his hotel, or the street in which the hotel was. He tried to remember what turnings he had taken and what streets he had walked along, but could not. Wandering along the streets, he saw many hotels, but he could not find his hotel. What was to be done? It was already very late, and he was tired. The Englishman went into the first hotel he saw and took a room there. Before going to bed, he sent another telegram to his wife. The telegram said, «Send me my Paris address