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ответ:AB= 2,4 см
ВС=3 см
СД=2,4 см
АД=3см
Объяснение:
Там достаточно легко. Смотри если там есть пропорция (:) то это значит что будет x-коэфициен пропорцийности. (Не знаю как будет на русском) значит например AB- 4x
BC-5x (возьмём только две стороны; больше не надо)
Далее записуем формулу пириметра P=2(a+b)
P=2(AB+BC)
Дольше подставляешь, то что известно.
Выходит 10,8= 2*(4х+5х) и решаешь
10,8=18х
Неизвестные в левую часть, известные в правую.
18х=10,8
Потом находим х. Это умножение. Значит надо добуток (хз как в русском) поделить на известный множник.
х=10,8:18
х=0,6
теперь просто если это параллелограм то АВ=СД= 2,4 см
ВС=АД= 3 см
Вроде всё. Изменяюсь за ошибки. Пыталась объяснить своими словами. Если вы знаете хорошо английский, то можете с моими вопросами у меня на странички. А то я в нем не сильна
Виділяємо повні квадрати:
для x: 5 (x²-2 * 3x + 3²) -5 * 3² = 5 (x-3) ²-45,
для y: 9 (y² + 2 * 1y + 1) -9 * 1 = 9 (y + 1) ²-9.
В результаті отримуємо: 5 (x-3) ² + 9 (y + 1) ² = 45
Розділимо всі вираз на 45: ((x-3) ² / 9) + ((y + 1) ² / 5) = 1.
Параметри кривої - це еліпс, його півосі a = 3 і b = √5.
Центр еліпса в точці: C (3; -1)
Координати фокусів F1 (-c; 0) і F2 (c; 0), де c - половина відстані між фокусами: F1 (-2; 0), F2 (2; 0). з = √ (9 - 5) = + -√4 = + -2.
З урахуванням центру, координати фокусів рівні:
F1 ((- 2 + 3) = 1; -1), F2 ((2 + 3) = 5; -1).
Ексцентриситет дорівнює: е = с / а = 2/3.
Внаслідок нерівності c <a ексцентриситет еліпса менше 1.