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miki68

Ответ:


Пошаговое объяснение:

1м=10дм

1м²=100дм²

80м=800дм

S=800*9=7200дм²=72м² площадь всего пола

S=72*1/3=24м² площадь застеленного пола

72-24=48м² площадь не застеленного пола

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