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Ответ дан
prettypushkova

1) Масштаб 1 : 3

28 мм на плане = 28 · 3 = 84 мм - длина отрезка в реальности;

2) Масштаб 2 : 7 = 1 : 3,5

84 см в реальности = 84 : 3,5 = 24 мм - длина отрезка на плане.

Ответ: 24 мм.

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