Пошаговое объяснение:
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Пошаговое объяснение:
№ 1. В новой квартире хотят поставить окно. Ширина окна должна быть 1 м 20 см, а длина 1 м узнать периметр окна и правильно его поставить.
1 м – 100 см
100 + 20 = 120 (см)
P = 2 × (100 + 120) = 2 × 220 = 440 (см)
ответ: P = 440 см.
№ 2.
В новой квартире так же хотят поставить дверь длиной 2 м 10 см и шириной 1 м. Теперь нужно узнать какова площадь двери.
2 м = 200 см
200 + 10 = 210 (см)
S = 210 × 100 = 21000 (см²)
ответ: S = 21000 см²
№ 3. Комната в новой квартире имеет высоту 2 м 80 см, ширину 5 м и длину 3 м. Узнайте объём данной комнаты.
2 м 80 см = 280 см
280 × 500 = 140000 см² = 1400 м²
1400 × 3 = 4200 м³
ответ: 4200 м³
