Предмет: Математика, автор: КатяКалинина80

периметр прямоугольника 18 см, длина в 2 раза больше ширины. Решение уравнением

Ответы

Автор ответа: LEXSUS18

(х+2х)*2=18
2х+4х=18
х=18÷6
х=3(см) ширина прямоугольника
3*2=6(см) длина прямоугольника

Автор ответа: LEXSUS18

так наверно

Автор ответа: milmar01

Пусть x-ширина, тогда 2x-длина, так как по условию задачи сказано, что периметр равен 18, то составим уравнение:
2(x+2x)=18
2*3x=18
6x=18
x=3-ширина
2x=6-длина

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