Предмет: Математика, автор: EDanilova

Длина прямоугольника в 4 раза больше его ширины.Найди площадь прямоугольника,если его ширина на 12 м. меньше длины.

Ответы

Автор ответа: skrill442

0

ширина Х. длина 3х.
3х-х=12
х=6
это ширина.
длина 18
площадь: 18*6=
кто бы посчитал?
то же самое , но словами. ширина 1 часть. длина 3 части. 3 части больше одной части на 2 части или на 12 см. значит, 1 часть равна 6
площадь равна произведению дл

Автор ответа: 24Julia24

0

Пусть ширина х, а длина - у, тогда получаем функцию

{у=4х

{х=у-12

х=у-12
х=4х-12
4х-х=12
3х=12
х=4 у=4х
у=16
S=4*16=64

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