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Ответ

Ответ дан
linsi91
1. 80*9=720 (дм.кв) - площадь пола.
2. 720 : 3 = 240 (дм.кв)
3. 720 -240 =480(дм.кв ).
Ответ : 480 дм.кв незастланной части пола.

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