Предмет: Математика, автор: vitatelka40

Знайди сторони прямокутника, якщо одна з них більша за другу на 1,5 см, а периметр прямокутника дорівнює 19 см.

Ответы

Автор ответа: prettypushkova

P = (a + b) · 2 = 19 см - периметр прямоугольника

Пусть а = х см - ширина, тогда b = (х + 1,5) см - длина. Уравнение:

(х + х + 1,5) · 2 = 19

(2х + 1,5) · 2 = 19

4х + 3 = 19

4х = 19 - 3

4х = 16

х = 16 : 4

х = 4 (см) - ширина а

4 + 1,5 = 5,5 (см) - длина b

Ответ: 4 см и 5,5 см.

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