Докажите , что середины сторон прямоугольника являются вершинами ромба . ( 8 класс )

Ответить на вопросы по тексту: Darling john! So I am in Mexico City. i learn Spanish. I work very hard. Mexico City is much larger than Cleveland, and it is more interesting. I think it is the best city in the world. But theres too much traffic and smog, and there are not enough restaurants with American food, but I like it. All of my teachers are very nice. Some of them are better than others. None of them speak English to us, so we all have to speak Spanish. I will write again soon. All my love, Mary. 1) Where is Mary? 2) What language does she learn? 3) Does she work hard? 4) Is Mexico City larger than Cleveland? 5) Is it more interesting? 6) Is Mexico City the biggest city in the world? 7) Is there too much traffic and smog in the city? 8) Are there many restaurants with American food there? 9) Are Marys teachers very nice? 10) Do they speak English to their students?

Есть ли образовательная ткань у старой сосны и дуба?

Первое время движение 2с тело движется со скоростью, модуль которой 5м/с, а затем в течение 3с - со скоростью модуль которой 7м/с. Средняя скорость тела равна...