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Автор - elenazgonnikowa

ширина прямоугольника на 40 %меньше длины пириметр 80см .найдите площадь?

Ответ

Автор - rebzi
80/2=40
длина=x
ширина= 0.6x
40=1.6x
Тогда x=25
25*0.6=15
25*15=375см^2

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