Система 4х^2+5y^2 и x^2+5y^2 -25

Вам нужно как можно быстрее найти гнилой легкий грецкий орех среди 15 таких же орехов. Какое наименьшее число взвешиваний нужно сделать на весах?

CОЧИНЕНИЕ НА ТЕМУ ЗИМНИЙ ЛЕС.

My dream room is very big and light. There is one window and there are no curtains. The wallpapers are orange and green. On the wall there are a lot of posters. There are no plants. There is a sofa, a desk, a computer on the desk, a wardrobe. There is a TV on the wall. There is a sport area in the corner. There is a music centre. My dream room is a place where I live alone, where I can do sports and listen to music oo watch TV and of course invite my friends. нужен перевод