Question

помогите пожалуйста, 5 класс математика СРОЧНО 3,4,5 заданияяяяя

Answer 1

Задание 3.                                                                                                            Длина одной стороны треугольника (3/12)Р, другой стороны (5/12)Р. Составляем уравнение: 
Р = (3/12)Р + (5/12)Р + 2,8,                                                                                            Р = (8/12)Р + 2,8,
Р = (2/3)Р + 2,8,                                                                                                            Р - (2/3)Р = 2,8,                                                                                                          (1/3)Р = 2,8,                                                                                                                     Р = 2,8 : 1/3,                                                                                                                    Р = 8,4.
Находим первую сторону: (3/12)Р = 8,4 * 3/12 = 252/120 = 2,1, находим вторую сторону: (5/12)Р = 8,4 * 5/12 = 420/120 = 3,5.                                                  Проверка: 2,1 + 3,5 + 2,8 = 8,4.