Предмет: Математика, автор: danieletihad

. Периметр прямоугольника 25,2 дм. Длина его больше ширины в 1,8 раза. Найдите площадь прямоугольника.

Ответы

Автор ответа: Alexаndr

a-ширина пр-ка,1.8а-длина прям-ка
Р=25дм
(а+1.8а)*2=25
5.6а=25.2
а=4.5
4.5 дм-ширина прям-ка=8.1дм-длина прям-ка
S=4.5*8.1=36.45дм2

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