Предмет: Математика, автор: АдЕлЯLiFE

номер 77 помогите помормоаолаьалис

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Автор ответа: OPetroW

Пусть ширина = x см. Тогда длина = 1 5/7 * x см. Составим и решим уравнение.
2x + 2x * 1 5/7 = 38
2x (1 + 1 5/7) = 38
2x * 2 5/7 = 38
2x = 38 : 2 5/7
2x = 14
x = 7 см - ширина
7 * 1 5/7 = 12 см - длина

S = 7 * 12 = 84 см² - площадь
Ответ: 84 см²

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