Предмет: Математика, автор: maloy230384

Найти значение
(x-5)·(x+4)-(x-0,4)

Ответы

Автор ответа: 8109664

Відповідь:

(x-5)·(x+4)-(x-0,4) = x^2 - 5x + 4x - 20 - x + 0,4

Упрощая выражение, получим:

x^2 - 0,6x - 19,6

Покрокове пояснення:

egorvlsv009: Для начала, давайте раскроем скобки, используя распределительный закон умножения:

(x-5)·(x+4)-(x-0,4) = x·x + x·4 - 5·x - 5·4 - x + 0,4

Далее, объединим подобные слагаемые:

x·x + x·4 - 5·x - 5·4 - x + 0,4 = x·x - x + x·4 - 5·x - 5·4 + 0,4

Сокращаем сначала -x и -5x:

x·x - x + x·4 - 5·x - 5·4 + 0,4 = x·x - 4·x - 5·4 + 0,4

Теперь сократим -5·4 и 0,4:

x·x - 4·x - 5·4 + 0,4 = x·x - 4·x - 21,6

Таким образом, исходное выражение (x-5)·(x+4)-(x-0,4) равно:

x·x - 4·x - 21,6

Ответ: x^2 - 4x - 21.6

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