Question

Решите систему уравнений методом подстановки {x+3y=2 {3x+2y=24​ Смотреть ответ Tes2able Tes2able {х+3у=2. |*(-3){3х+2у=24{-3х-9у=-6{3х+2у=24-7у=18у=-18/7 (-2 4/7){у=-18/7{3х+2*-18/7=243х+2*-18/7=243х-36/7=243х=29 1/7х= 68/7. (9 5/7){у=-2 4/7{х= 9 5/7Ответ : (9 5/7;-2 4/7) Новые вопросы в Математика 323. Запиши у вигляді нескінченного періодичного дробу частку: 1) 11 : 9; 2) 8: 15; 3) 53:6; 4) 35,4 11. одна сторона прямоугольнника в 3 раза больше чем другая найдите стороны прямоугольника если его периметр равен 72 см правильно ли что 3/5 = 6/15 3/5 = 9/15 3/5= 10/15 Знайдіть сторони паралелограма, периметр якого дорівнює 78 см, а одна із сторін у 2 рази менше вiд iншої. ДУЖЕ ТРЕБА ПОЖАЛУЙСТА ПОМОГИТЕ Я БУДУ ОЧЕНЬ БЛОГОДАРНА!! Обчислить: 1) 4/5 + 1/8 2) 7/10 - 2/3 3) 2/7 + 5/21 4) 16/27 - 1/9 5) 5/12 + 3/8 6) 11/12 - 7 … /9 7) 7/40 + 3/5 8) 17/18 - 3/4 Предыдущий Следующий Вместе мы знаем больше Этот сайт использует cookies Политика Cookies . 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Answer 1

Привет! Я рад помочь с решением твоих математических задач.

1) Решение системы уравнений методом подстановки: У нас есть два уравнения: x + 3y = 2 3x + 2y = 24

Мы можем решить первое уравнение относительно x и подставить его во второе уравнение: x = 2 - 3y 3(2 - 3y) + 2y = 24

Раскроем скобки: 6 - 9y + 2y = 24

Соберем переменные вместе: -7y + 6 = 24

Вычтем 6 из обеих сторон: -7y = 18

Разделим на -7: y = -18/7

Теперь, чтобы найти x, подставим значение y в первое уравнение: x + 3(-18/7) = 2

Упростим: x - 54/7 = 2

Добавим 54/7 к обеим сторонам: x = 2 + 54/7

Упростим: x = 68/7

Таким образом, решение системы уравнений методом подстановки равно x = 68/7 и y = -18/7.

2) Запишем дроби в виде непрерывной периодической десятичной дроби: 1) 11/9 = 1.(2) 2) 8/15 = 0.5(3) 3) 53/6 = 8.(8) 4) 35.4/11 = 3.(2) 3) Пусть одна сторона прямоугольника равна x, тогда другая сторона будет равна 3x. Периметр прямоугольника равен 2*(x + 3x) = 8x. Условие задачи говорит, что периметр равен 72 см, поэтому: 8x = 72 x = 9

Таким образом, стороны прямоугольника равны 9 см и 27 см.

4) 3/5 = 6/10, 3/5 = 9/15, 3/5 = 10/15.

5) Пусть одна сторона параллелограмма равна x, тогда другая сторона будет равна 2x. Периметр параллелограмма равен 2*(x + 2x) = 6x. Условие задачи говорит, что периметр равен 78 см, поэтому: 6x = 78 x = 13

Таким образом, стороны параллелограмма равны 13 см и 26 см.

Я надеюсь, что мои ответы помогли тебе. Если у тебя есть еще вопросы, не стесняйся задавать их!