при каких значениях Х дробь корень Х - 2/ Х-4 принимает наибольшее значение

сторони чотирикутника пропорційні числам 2,5,3,7. Його найбільша сторона на 15 см більша за найменшу. Знайдіть периметр чотирикутника.

There was once a donkey who was tired of being a donkey. "l wish l were a lion or tiger," he thought. So one day when he found a lion s skin he put it on. Then he began trying to frighten whoever he happened to meet along the road. Everyone he met believed he was lion, and ran away as quickly as they could on seeing him approach. Delighted by the success of his trick, the donkey brayed loudly. The fox guessed who was hiding under the lion s skin and, laughing, he said, "My dear fried , you can come out now. l have been afraid of you too, if l hadn t heard your loud voice."

Построй прямоугольник ABCD со сторонами 2см5мм и 4см5мм.Найди периметр прямоугольника.